14 CFR § 253.9 - Retroactive changes to contracts of carriage.

---
identifier: "/us/cfr/t14/s253.9"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 253.9 - Retroactive changes to contracts of carriage."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "253.9"
section_name: "Retroactive changes to contracts of carriage."
chapter_name: "OFFICE OF THE SECRETARY, DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS)"
subchapter_number: "A"
subchapter_name: "ECONOMIC REGULATIONS"
part_number: "253"
part_name: "NOTICE OF TERMS OF CONTRACT OF CARRIAGE"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 40113, 40114, 41501, 41504, 41506, 41509, 41510, 41511, 41702, and 41711."
regulatory_source: "ER-1302, 47 FR 52134, Nov. 19, 1982, unless otherwise noted."
cfr_part: "253"
---


# 253.9 Retroactive changes to contracts of carriage.

An air carrier may not retroactively apply to persons who have already bought a ticket any material amendment to its contract of carriage that has significant negative implications for consumers.

[Doc. No. DOT-OST-2007-0022, 74 FR 69002, Dec. 30, 2009]