Interstate Air Transportation
The transportation of passengers or property by aircraft as a common carrier for compensation, or the transportation of mail by aircraft--
(A) between a place in--
(i) a State, territory, or possession of the United States and a place in the District of Columbia or another State, territory, or possession of the United States;
(ii) Hawaii and another place in Hawaii through the airspace over a place outside Hawaii;
(iii) the District of Columbia and another place in the District of Columbia; or
(iv) a territory or possession of the United States and another place in the same territory or possession; and
(B) when any part of the transportation is by aircraft.
Source: U.S. Code.