14 C.F.R. § 221.91 Delivering tariff publications to Department.
Title 14 - Aeronautics and Space
Tariff publications will be received for filing only by delivery thereof to the Department electronically, through normal mail channels, or by delivery thereof during established business hours directly to that office of the Department charged with the responsibility of processing tariffs. No tariff publication will be accepted by the Department unless it is delivered free from all charges, including claims for postage.
Title 14: Aeronautics and Space
PART 221—TARIFFS
Subpart J—Filing Tariff Publications With Department
§ 221.91 Delivering tariff publications to Department.