Interstate air transportation
Interstate air transportation means the carriage by aircraft of persons or property as a common carrier for compensation or hire, or the carriage of mail by aircraft in commerce:
(1) Between a place in a State or the District of Columbia and another place in another State or the District of Columbia;
(2) Between places in the same State through the airspace over any place outside that State; or
(3) Between places in the same possession of the United States;
Source
14 CFR § 1.1
Scoping language
As used in Subchapters A through K of this chapter, unless the context requires otherwise: