14 CFR 292.2: Definitions.

For purposes of this part:

Cargo means property other than baggage accompanied or checked by passengers, or mail.

Cargo tariff means a tariff containing rates, charges or provisions governing the application of such rates or charges, or the conditions of service, applicable to the scheduled transportation of cargo in foreign air transportation.

Direct air carrier means an air carrier or foreign air carrier directly engaged in the operation of aircraft under a certificate, regulation, order, exemption or permit issued by the Department or its predecessor, the Civil Aeronautics Board.