49 CFR 821.25 : Transportation (§ 1.1 To Parts 1581-1699) — (§ 572.1 To Parts 851-999) — Other Regulations Relating To Transportation (Continued) (§ 572.1 To Parts 851-999) — National Transportation Safety Board (§ 800.1 To Parts 851-999) — Rules Of Practice In Air Safety Proceedings (§ 821.1 To § 821.64) — Special Rules Applicable To Proceedings Under 49 U.S.C. 44703 (§ 821.24 To § 821.26) — Burden of proof.