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Smart Summary

Factual and Procedural Background

In 2005 Mesa and Delta entered into a Connection Agreement under which Mesa (through its subsidiary Freedom Airlines) operated regional flights for Delta. Delta asked Mesa to move operations from Orlando to JFK, where coordinated cancellations were more common. Mesa sought assurances that coordinated cancellations would not be counted against its contract "completion rate." Delta managers allegedly gave verbal assurances that coordinated cancellations would not be counted; Mesa relied on those assurances, excluded coordinated cancellations from its invoices, and Delta paid some invoices without objection. In 2008 Delta initiated steps to terminate the Connection Agreement, sending Mesa a termination letter claiming Mesa fell below the 95% completion-rate threshold for three months in a six-month period (October and December 2007 and February 2008). Mesa filed suit and moved for a preliminary injunction to prevent Delta from terminating the contract, asserting, inter alia, an equitable estoppel claim. The district court granted the preliminary injunction; the Eleventh Circuit affirmed.

Legal Issues Presented

  1. Whether New York law governed Mesa's equitable estoppel claim (i.e., whether the contract's choice-of-law clause applied to equitable claims).
  2. Whether Mesa demonstrated a substantial likelihood of success on its equitable estoppel claim under New York law (i.e., whether the district court's findings established a false representation, reasonable reliance, and detrimental change of position).

Arguments of the Parties

Defendant-Appellant (Delta Air Lines, Inc.)

  • Argued the contract's choice-of-law clause should not apply to equitable claims (an argument the court found waived because not raised below).
  • Contended the district court's findings were insufficient under New York law to establish estoppel elements—claiming silence does not constitute a false representation.
  • Argued Mesa could not have reasonably relied on Delta's payments because payments occurred after Mesa agreed to cancel flights.
  • Contended the Connection Agreement's "no oral modifications" clause made reliance on oral assurances unreasonable and precluded estoppel.
  • Relied on Jewell v. Irvmac Shoe Shops, Inc. as authority that "no oral modifications" precludes estoppel (the court rejected Jewell as inapplicable and non-authoritative).

Plaintiffs-Appellees (Mesa Air Group, Inc. and Freedom Airlines, Inc.)

  • Asserted Delta orally assured Mesa that coordinated cancellations would not be counted against Mesa's completion rate, and Mesa relied on those assurances in agreeing to hundreds of coordinated cancellations and in its invoicing practice.
  • Contended Delta's subsequent attempt to terminate the contract based on counting coordinated cancellations was barred by equitable estoppel.
  • Also asserted, alternatively, that Delta's termination breached an implied duty of good faith (the court did not reach this argument after deciding estoppel).

Table of Precedents Cited

Precedent Rule or Principle Cited For Application by the Court
Fischer v. S/Y NERAIDA, 508 F.3d 586, 592 (11th Cir. 2007) Standard of review: factual findings reviewed for clear error. Used to state that the district court's factual findings are reviewed for clear error.
Keener v. Convergys Corp., 342 F.3d 1264, 1267 (11th Cir. 2003) Standard of review: legal conclusions reviewed de novo. Applied to explain de novo review of legal conclusions in preliminary-injunction review.
BellSouth Telecomms., Inc. v. MCImetro Access Transmission Svcs., LLC, 425 F.3d 964, 968 (11th Cir. 2005) Standard of review: ultimate injunction decision reviewed for abuse of discretion; outlines preliminary-injunction elements. Used to state the four-part preliminary injunction test and review standard.
Daewoo Motor Am., Inc. v. Gen. Motors Corp., 459 F.3d 1249, 1256-57 (11th Cir. 2006) Waiver principle: choice-of-law arguments not presented to district court are waived on appeal. Applied to hold Delta waived its argument that New York law did not apply to equitable claims.
Nassau Trust Co. v. Montrose Concrete Prods. Corp., 56 N.Y.2d 175, 451 N.Y.S.2d 663, 436 N.E.2d 1265 (1982) Defines elements of estoppel under New York law (false representation, reasonable reliance, detrimental change in position). Treated as the controlling formulation of New York estoppel law and applied to evaluate Mesa's claim.
River Seafoods, Inc. v. JPMorgan Chase Bank, 19 A.D.3d 120, 796 N.Y.S.2d 71 (App. Div. 1st Dep't 2005) Illustrates alternative Appellate Division formulation (First Dept.) requiring lack of knowledge rather than false representation. Referenced in discussing differing Appellate Division tests but court followed Nassau Trust (Court of Appeals).
Benincasa v. Garrubbo, 141 A.D.2d 636, 529 N.Y.S.2d 797 (App. Div.2d Dep't 1988) Appellate Division formulation requiring a false representation but not explicitly requiring detrimental change. Noted among varying Appellate Division approaches; court nonetheless followed Nassau Trust.
Hayden v. S W Meat Poultry, 221 A.D.2d 823, 634 N.Y.S.2d 226 (App. Div.3d Dep't 1995) Another Appellate Division formulation referenced for variance in estoppel tests. Noted in the discussion of differing standards; court applied Nassau Trust.
Airco Alloys Div., Airco Inc. v. Niagara Mohawk Power Corp., 76 A.D.2d 68, 430 N.Y.S.2d 179 (App. Div. 4th Dep't 1980) Fourth Department "kitchen sink" approach listing multiple estoppel elements. Referenced to illustrate jurisdictional variations; court adhered to Nassau Trust.
Erie R.R. Co. v. Tompkins, 304 U.S. 64, 78 (1938) Federal courts apply the law of the state for state-law issues (choice-of-law principle). Invoked to explain that New York Court of Appeals law governs the substantive estoppel claim.
John Robert P. v. Vito C., 23 A.D.3d 659, 804 N.Y.S.2d 802 (App. Div.2d Dep't 2005) Indicates that false conduct can include failure to promptly assert a right when such failure renders it inequitable to later assert the right. Applied to support that Delta's silence and payment of invoices could constitute conduct satisfying falsity.
CBS Broad., Inc. v. EchoStar Commc'ns Corp., 450 F.3d 505, 517 n.23 (11th Cir. 2006) Deference owed to district court credibility determinations. Used to justify deferring to the district court's crediting of Mesa witnesses over Delta's.
Access Now, Inc. v. Southwest Airlines Co., 385 F.3d 1324, 1330 (11th Cir. 2004) Rule that arguments not raised in opening brief are waived. Applied to conclude certain arguments (raised only at oral argument) were waived.
Comm'r v. Estate of Bosch, 387 U.S. 456, 465 (1967) When highest state court has not addressed an issue, intermediate appellate decisions are persuasive authority. Used to explain reliance hierarchy for state-law interpretation; but court relied on New York Court of Appeals (Nassau Trust).
Jewell v. Irvmac Shoe Shops, Inc., 19 Misc.2d 815, 187 N.Y.S.2d 412 (Sup. Ct. 1959) Trial-court decision cited by Delta for proposition that "no oral modifications" precludes estoppel. Court rejected Jewell as a non-authoritative trial-court decision and inapplicable on its facts; therefore it did not preclude estoppel here.

Court's Reasoning and Analysis

The court applied the appropriate standards of review (de novo for legal conclusions; clear error for facts; abuse of discretion for the injunction). It held New York law governed Mesa's estoppel claim because the Connection Agreement included a New York choice-of-law clause and Delta waived its argument that the clause did not extend to equitable claims. Applying New York law as articulated in Nassau Trust, the court examined the three estoppel elements.

On falsity, the court found sufficient evidence of affirmative conduct and representations: Delta's COO and a Delta manager allegedly assured Mesa that coordinated cancellations would not count; Mesa memorialized the agreement by email; follow-up emails went unanswered; and Delta paid invoices that excluded coordinated cancellations. The district court credited Mesa's COO's testimony over Delta's manager, and the appellate court deferred to that credibility determination.

On reliance, the court found Mesa reasonably relied: Mesa agreed to hundreds of coordinated cancellations after the alleged oral assurances, and payment without objection corroborated reliance. The court rejected Delta's waived argument that the contract's "no oral modifications" clause barred estoppel, citing Nassau Trust for the proposition that estoppel may prevent exercise of contractual rights despite such a clause.

On detrimental change, the court found Mesa altered its position (excluded coordinated cancellations from completion-rate calculations, agreed to cancel flights) and that the evidence supported the district court's finding that Mesa would have refused many cancellation requests absent Delta's assurances. The court also rejected Delta's reliance on Jewell as both non-authoritative and factually distinguishable.

Because Mesa demonstrated a substantial likelihood of success on its equitable estoppel claim under New York law, the court concluded the district court did not abuse its discretion in granting the preliminary injunction. The court therefore affirmed and declined to reach Mesa's alternative good-faith-breach argument.

Holding and Implications

AFFIRMED

Direct effect: The Eleventh Circuit affirmed the district court's grant of a preliminary injunction preventing Delta from terminating the Connection Agreement on the asserted completion-rate grounds while the injunction remains in effect. The opinion rested on application of New York estoppel principles to the district court's credited factual findings. The court did not announce a broader rule beyond its application of existing New York and federal precedents and did not reach Mesa's alternate good-faith claim.

MESA AIR GROUP, INC., a Ne v. da corporation, Freedom Airlines, Inc., a Ne

CUDAHY, Circuit Judge:

Freedom Airlines has been a regional carrier for Delta Air Lines since 2005. After Delta sought to terminate its regional connection agreement with Mesa Air Group, Freedom's corporate parent, Mesa commenced this action seeking an injunction prohibiting Delta from terminating the agreement. The district court granted Mesa's motion for a preliminary injunction, holding, inter alia, that Mesa had shown a substantial likelihood of success on its equitable estoppel claim. We affirm.

In what follows, we will refer to the plaintiffs-appellees collectively as Mesa.

I. BACKGROUND

The district court's factual findings, which we review for clear error, Fischer v. S/Y NERAIDA, 508 F.3d 586, 592 (11th Cir. 2007), were these: in 2005, Mesa and Delta entered into an agreement for Mesa to act as a Delta regional carrier — to operate its own aircraft under the Delta name and to service Delta passengers on Delta-scheduled flights. Initially, Mesa operated out of Orlando, Florida. Subsequently, Delta asked Mesa to operate flights out of New York's John F. Kennedy Airport.

Following the district court, we will refer to this contract as the Connection Agreement.

JFK has worse weather and more airspace congestion than Orlando, which makes flight cancellations more common. The increased likelihood of cancelled flights was significant because the Connection Agreement rewards Mesa for months where it achieves a high "completion rate," and authorizes Delta to terminate the contract if Mesa's completion rate falls below 95% for three months of any consecutive six-month period.

The Connection Agreement does not define "completion rate." Initially, the parties understood "completion rate" to mean the ratio of scheduled flights to flights that actually reach their destination. However, flights may be cancelled for a number of reasons. They may be cancelled by the FAA based on weather, or by air traffic control based on congestion. Alternatively, they may be cancelled in advance by the carrier itself when the carrier anticipates unfavorable conditions. Specifically, when a carrier anticipates that only a portion of scheduled flights will be allowed to depart, it may of its own initiative cancel lower priority flights to increase the likelihood that higher priority flights will reach their destinations. This is called a "coordinated cancellation."

Between 2005 and 2006, when Mesa was operating out of Orlando, its completion rate was often over 99%. During this period, Mesa counted coordinated cancellations against its reported completion rate, and did not report such cancellations to Delta as a separate statistic.

Because JFK's less hospitable operating conditions had the potential to affect not only Mesa's compensation but also its ability to meet the Connection Agreement's renewal targets, Mesa sought assurances from Delta that Mesa would not be penalized by the move. Mesa was particularly concerned about coordinated cancellations, which were much more common at JFK than at Orlando. In early 2007, Delta's COO assured Mesa's CEO that Delta would work with Mesa to make appropriate modifications to the parties' agreement to ensure that Mesa would not be penalized by the move to JFK. Subsequently, Delta manager Courtney Boyd promised Mesa COO Jorn Bates that coordinated cancellations would not be counted toward Mesa's completion rate. In reliance on these verbal assurances, Mesa subsequently agreed to hundreds of coordinated cancellations. It also stopped counting coordinated cancellations toward its completion rate and billed Delta accordingly. Between September 2007 and January 2008, Delta paid Mesa based on its reported completion rate calculation (which did not count coordinated cancellations) without objection.

Mesa's worries proved to be prescient. Between September 2007 and March 2008, Delta directed Mesa to cancel more than 400 flights. By contrast, in the two years Mesa operated out of Orlando, Delta directed only 60 coordinated cancellations.

The parties' relationship took a turn for the worse in 2008. In March 2008, Delta senior management met to discuss a plan to respond to rising fuel prices by "actively enforcing exit provisions in contracts" in order to reduce regional jet capacity. The plan singled out the Mesa Connection Agreement for cancellation. Subsequently, Delta initiated negotiations to buy out the Mesa contract, and, when negotiations proved unsuccessful, Delta sent Mesa a letter terminating the Connection Agreement ostensibly based on Mesa's completion rates for October 2007, December 2007 and February 2008. There is no dispute that Mesa's completion rate fell below 95% in February 2008 regardless of the method of accounting for coordinated cancellations. However, if coordinated cancellations are excluded, Mesa's completion rate for October and December of 2007 was well over 95%.

For instance, in October 2007, Delta directed the coordinated cancellation of 78 Mesa flights, 4.2% of its monthly schedule. If these cancellations were not counted against it, Mesa's completion rate for the month would have been 98.4%.

A week after receiving Delta's termination notice, Mesa commenced this action seeking an order enjoining Delta from terminating the Connection Agreement. Mesa subsequently moved for a preliminary injunction, arguing, inter alia, that Delta should be equitably estopped, based on its assurances that it would not do so, from counting coordinated cancellations toward Mesa's completion rate. The district court granted Mesa's motion for a preliminary injunction.

II. DISCUSSION

Our review of a district court's decision granting a preliminary injunction is somewhat complex: we review legal conclusions de novo, Keener v. Convergys Corp., 342 F.3d 1264, 1267 (11th Cir. 2003), factual findings for clear error, Fischer, 508 F.3d at 592, and the ultimate decision to grant or deny the injunction for abuse of discretion. BellSouth Telecomms., Inc. v. MCImetro Access Transmission Svcs., LLC, 425 F.3d 964, 968 (11th Cir. 2005).

To obtain a preliminary injunction, the moving party must show (1) substantial likelihood of success, (2) irreparable harm, (3) that the balance of equities favors granting the injunction and (4) that the public interest would not be harmed by the injunction. BellSouth, 425 F.3d at 968. Only the first element of this test is at issue here: Delta argues that Mesa has not shown a substantial likelihood of success on its estoppel claim. It argues first that the district court erred by applying New York law to Mesa's estoppel claim, and second that the district court's factual findings were insufficient as a matter of New York law to support estoppel.

As a threshold matter, we hold that the district court correctly applied New York law to Mesa's estoppel claim. The Connection Agreement contains a choice-of-law provision stating that the agreement is subject to New York law. Although Delta argues that this choice-of-law provision does not apply to equitable claims, it conceded at oral argument that it did not make this argument below. Thus, its argument that New York law should not apply to Mesa's estoppel claim is waived. See Daewoo Motor Am., Inc. v. Gen. Motors Corp., 459 F.3d 1249, 1256-57 (11th Cir. 2006) (holding that choice-of-law arguments, if not properly presented to the district court, are waived).

Delta's argument that it should be relieved of the consequences of this waiver because it was not given fair notice of Mesa's estoppel claim is without merit. Mesa's memorandum in support of its motion for a preliminary injunction stated that "through its conduct and assurances to Mesa, Delta is also estopped from terminating the Contract . . ." (No. 1:08-CV-1334-CC, Doc. no. 24, Ex. 1 at 19-20.) Delta, in turn, responded by arguing that under New York law, Mesa "cannot prevail on [its] claim for equitable estoppel." ( Id., Doc. no. 27 at 20.) Thus, Delta had actual notice of Mesa's estoppel claim and was able to respond.

Applying New York law to Mesa's estoppel claim, we agree with the district court that Mesa has shown a substantial likelihood of success. Under New York law, "[a]n estoppel rests upon the word or deed of one party upon which another rightfully relies and so relying changes his position to his injury." Nassau Trust Co. v. Montrose Concrete Prods. Corp., 56 N.Y.2d 175, 451 N.Y.S.2d 663, 436 N.E.2d 1265, 1269 (1982) (internal quotation marks omitted). The elements of estoppel, in other words, are (1) a false representation, (2) reasonable reliance and (3) a detrimental change of position. Delta argues that the district court's factual findings were insufficient to establish any of these elements. We disagree.

New York's Appellate Divisions have adopted slightly different formulations of the test for estoppel. On the test that the First Department has adopted, estoppel requires merely lack of knowledge by the party claiming estoppel, rather than an actual false representation by the party to be estopped. See River Seafoods, Inc. v. JPMorgan Chase Bank, 19 A.D.3d 120, 796 N.Y.S.2d 71, 74 (App. Div. 1st Dep't 2005). The Second and Third Departments, by contrast, require a false representation, but do not explicitly require a detrimental change in position. See Benincasa v. Garrubbo, 141 A.D.2d 636, 529 N.Y.S.2d 797, 800 (App. Div.2d Dep't 1988); Hayden v. S W Meat Poultry, 221 A.D.2d 823, 634 N.Y.S.2d 226, 227 (App. Div.3d Dep't 1995). Finally, the Fourth Department has adopted a "kitchen sink" approach that incorporates all of the elements of the other Appellate Divisions' tests, requiring (1) a false representation or concealment of material facts, (2) intent to induce reliance, (3) actual reliance, (4) knowledge of the true facts by the party to be estopped, (5) lack of knowledge of the true facts by the party seeking estoppel and (6) a prejudicial change in position. See Airco Alloys Div., Airco Inc. v. Niagara Mohawk Power Corp., 76 A.D.2d 68, 430 N.Y.S.2d 179, 187 (App. Div. 4th Dep't 1980).
These subtleties do not obviously make a great deal of difference. At any rate, because we are bound to apply the law as it has been announced by the New York Court of Appeals, Erie R.R. Co. v. Tompkins, 304 U.S. 64, 78, 58 S.Ct. 817, 82 L.Ed. 1188 (1938), we assume that under New York law, the elements of estoppel are those that were outlined in the Nassau Trust case.

A. False representation

Delta argues that there was no evidence that it made false representations to Mesa. Specifically, it argues that the district court's findings establish at most that it failed to correct Mesa's mistaken belief that the parties had reached an agreement not to count coordinated cancellations toward Mesa's completion rate; silence, it claims, does not constitute a false representation as a matter of New York law.

This argument is wide of the mark for two reasons. First, under New York law, words or conduct may give rise to estoppel. Nassau Trust, 451 N.Y.S.2d 663, 436 N.E.2d at 1269. Here, the evidence was that, after Mesa and Delta allegedly agreed to modify the Connection Agreement, Mesa Chief Operating Officer Jorn Bates sent Delta an email memorializing this agreement and Mesa representatives sent multiple followup emails referencing the agreement, to which Delta never responded. The evidence also showed that, knowing that Mesa believed that the parties had agreed that coordinated cancellations would not be counted against it and that Mesa had begun excluding coordinated cancellations from its invoices, Delta paid Mesa's invoices without objection. Even without more, Delta's failure to take reasonable steps to correct Mesa's alleged misunderstanding seems to us sufficient "conduct" to satisfy New York's falsity requirement. See, e.g., John Robert P. v. Vito C., 23 A.D.3d 659, 804 N.Y.S.2d 802, 804 (App. Div.2d Dep't 2005) (noting that false conduct includes "the failure to promptly assert a right [where such failure] has given rise to circumstances rendering it inequitable to permit the exercise of the right").

Further, Delta glosses over the most significant evidence in support of the district court's finding. After Delta assured Mesa that Delta was willing to modify the terms of the Connection Agreement, Mesa COO Jorn Bates testified that he met with Delta manager Courtney Boyd, who assured Bates that coordinated cancellations would not be counted toward Mesa's completion rate. Boyd, of course, denies this. But the district court specifically credited Bates' testimony and found Boyd to be non-credible. In the light of this credibility determination, which Delta does not challenge in its brief, there can be no serious question that there was a sufficient basis for the district court's finding that Delta had made false representations to Mesa.

During oral argument, Delta's counsel argued that this finding was clear error. However, this argument was not made in Delta's opening brief, or indeed its reply brief, and is therefore waived. See Access Now, Inc. v. Southwest Airlines Co., 385 F.3d 1324, 1330 (11th Cir. 2004). At any rate, the argument also lacks merit. We owe the district court's credibility determinations a great deal of deference. See CBS Broad., Inc. v. EchoStar Commc'ns Corp., 450 F.3d 505, 517 n. 23 (11th Cir. 2006). In the present case, the most probative evidence of the existence of an oral agreement was the witnesses' live testimony. Further, while there was some evidence to corroborate Boyd's version of events — and perhaps a fuller record would show that the facts are as Delta says — there was also a great deal of evidence corroborating Bates' testimony. Thus, the record does not show that the district court's decision to credit Bates' testimony and to discredit Boyd's was clear error.

B. Reasonable reliance

Delta also argues that the district court's finding that Mesa relied on Delta's false representations was clear error. Delta argues that the district court placed too much emphasis on the fact that Delta paid Mesa's invoices claiming credit for coordinated cancellations. According to Delta, Mesa could not have relied on these payments because the payments were made after Mesa already agreed to cancel the flights: the invoices were not paid until 2008, whereas Mesa agreed to cancel the flights in 2007.

Again, this argument simply overlooks Mesa's allegation that Delta orally agreed not to count coordinated cancellations toward Mesa's completion rate. According to Mesa, this agreement took place in late March or early April of 2007. Subsequently, Mesa agreed to cancel more than 400 flights at Delta's request. The evidence that there was such an agreement was clearly enough to support the district court's finding of reliance. That Delta paid Mesa's invoices without objection merely corroborated Mesa's version of events.

Delta's better argument, which it made in oral argument but not in its brief, is that Mesa's reliance was unreasonable under the circumstances because the Connection Agreement's "no oral modifications clause" gave Mesa notice that oral agreements were to have no effect. Delta argues that the purpose of the "no oral modifications" clause is to warn the parties not to rely on side agreements between their representatives, and therefore to give Delta assurance that it would not be bound by allegations concerning the incidental contacts between lower-level representatives. According to Delta, such assurance is particularly important in cases like this, where large companies have an ongoing relationship and contacts take place on a daily basis between the parties' representatives.

Because Delta did not make this argument in its briefs, we need not consider it here. For the sake of completeness, however, we note that while Delta's argument has some intuitive appeal, Mesa's claim is governed by New York law. See Erie R.R. Co. v. Tompkins, 304 U.S. 64, 78, 58 S.Ct. 817, 82 L.Ed. 1188 (1938) ("Except in matters governed by the Federal Constitution or by Acts of Congress, the law to be applied in any case is the law of the state."). The only question, therefore, is whether under New York law, oral representations can trigger estoppel notwithstanding the existence of a "no oral modifications" clause.

The Nassau Trust case, which is the leading case on New York's law of estoppel, gives an affirmative answer to this question. Nassau Trust involved a foreclosure action under a mortgage agreement that contained a "no oral modifications" provision. 451 N.Y.S.2d 663, 436 N.E.2d at 1267. In spite of the existence of the "no oral modifications" provision, the court held that the plaintiff/mortgagee could be estopped. Indeed, the Court of Appeals reached this conclusion in spite of the fact that the dissent made the same argument that Delta makes here. Id. at 1273 (Jasen, J., dissenting) (arguing that the "no oral modifications provision" is "designed precisely to avoid litigation, such as presented by this case, which is based on mere bare allegations of oral waivers"). This shows that, under New York law, estoppel may be invoked to prevent the exercise of contractual rights, even when that contract contains a "no oral modifications" clause.

The Nassau Trust case also contains a discussion that explains the court's rejection of the argument that the dissent made in that case and that Delta makes here. The court noted that a modification is a more far reaching remedy than an estoppel. Id. at 1269. Because a modification permanently changes an contract's terms, whereas an estoppel requires only a specific act of forbearance, it stands to reason that New York courts would require at least as great a showing of proof to establish the former. C. Detrimental Change

During oral argument, Delta relied primarily on Jewell v. Irvmac Shoe Shops, Inc., 19 Misc.2d 815, 187 N.Y.S.2d 412 (Sup.Ct. 1959), as authority for the proposition that the "no oral modifications" clause precludes the invocation of equitable estoppel. As a procedural matter, Jewell is of dubious relevance. Again, Mesa's claim is governed by New York law. Typically, we look to decisions from the highest court, here the New York Court of Appeals, to elucidate state law. See Erie, 304 U.S. at 78, 58 S.Ct. 817 (suggesting that "the law of the state shall be declared by its Legislature . . . or by its highest court. . ."). When the highest court has not addressed an issue, we may look to intermediate appellate court decisions. See Comm'r v. Estate of Bosch, 387 U.S. 456, 465, 87 S.Ct. 1776, 18 L.Ed.2d 886 (1967) ("[A]n intermediate appellate state court . . . is a datum for ascertaining state law which is not to be disregarded by a federal court unless it is convinced by other persuasive data that the highest court of the state would decide otherwise.") (internal quotation marks omitted). However, Jewell is a state trial court decision — indeed, it is a fifty-year-old decision following a summary proceeding. On no interpretation of Erie of which we are aware may a decision by a state trial court be credited as determining the law of the state.
At any rate, Jewell is inapposite. Jewell involved an action to collect unpaid rent. The tenant alleged that the landlord orally promised to reduce his rent by $150 per month, and claimed that the landlord was estopped from enforcing the lease as written. The court rejected the tenant's argument. However, the decision sheds no light on the present case. The court there did not analyze whether the existence of a "no oral modifications" clause precludes the invocation of equitable estoppel. Instead, the court concluded the equitable estoppel did not apply in that case because the tenant had not shown detrimental reliance. 187 N.Y.S.2d at 415. Thus, even if the Jewell decision could elucidate New York law, the decision, if anything, seems to stand for the rather unsurprising proposition that estoppel cannot be used to frustrate the enforcement of a written instrument where the estoppel claim fails on the merits.

Nor, finally, can we agree with Delta that Mesa cannot show that the flights that Mesa agreed to cancel as a courtesy to Delta would have reached their destination but for Delta's actions. The district court found that Mesa had a legal right to refuse to comply with Delta's cancellation requests, and credited Mesa witnesses who testified that they would have immediately stopped acquiescing to Delta's requests if they had known that Delta intended to count hundreds of coordinated cancellations toward Mesa's completion rate. Further, the record suggests that during this period, Delta directed the cancellation of Mesa flights in order to give preference to its own flights. For instance, during October and December of 2007, Delta ordered the cancellation of 5.5% of Mesa's flights. By contrast, Delta cancelled approximately 1.6% of its own flights during this period. In October 2007 alone, Delta directed the cancellation of 78 Mesa flights while cancelling only 8 of its own. In light of all this, it was not clear error for the court to find that, but for Delta's assurances, Mesa would likely have operated a number of the flights that were cancelled at Delta's request.

III. CONCLUSION

The evidence showed that Delta induced Mesa to agree to Delta's coordinated cancellations by promising not to count such cancellations against it and then, having benefitted from Mesa's willingness to extend Delta this courtesy, attempted to cancel the parties' contract on the theory that this promise was invalid as a matter of law. In the light of this evidence, the district court did not abuse its discretion when it granted Mesa's motion for a preliminary injunction.

Having found this, we need not reach Mesa's alternative argument that Delta's attempt to terminate the Connection Agreement breached its implied duty of good faith.

AFFIRMED.

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MESA AIR GROUP, v. DELTA AIR LINES
(Jul 1, 2009)