14 C.F.R. § 221.203 Unique rule numbers required.
Title 14 - Aeronautics and Space
(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.
Title 14: Aeronautics and Space
PART 221—TARIFFS
Subpart R—Electronically Filed Tariffs
§ 221.203 Unique rule numbers required.