14 CFR § 221.203 - Unique rule numbers required.

---
identifier: "/us/cfr/t14/s221.203"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 221.203 - Unique rule numbers required."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "221.203"
section_name: "Unique rule numbers required."
chapter_name: "OFFICE OF THE SECRETARY, DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS)"
subchapter_number: "A"
subchapter_name: "ECONOMIC REGULATIONS"
part_number: "221"
part_name: "TARIFFS"
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. 40101, 40109, 40113, 46101, 46102, chapter 411, chapter 413, chapter 415 and chapter 417, subchapter I."
regulatory_source: "64 FR 40657, July 27, 1999, unless otherwise noted."
cfr_part: "221"
---


# 221.203 Unique rule numbers required.

(a) Each “bundled” and “unbundled” normal economy fare applicable to foreign air transportation shall bear a unique rule number.

(b) The unique rule numbers for the fares specified in this section shall be set by mutual agreement between the filer and the Department prior to the implementation of any electronic filing system.