49 U.S.C. § 47301

1. (1)“airport property” means an interest in property used or useful in operating and maintaining an airport.
2. (2)“airway property” means an interest in property used or useful in operating and maintaining a ground installation, facility, or equipment desirable for the orderly and safe operation of air traffic, including air navigation, air traffic control, airway communication, and meteorological facilities.
3. (3)“foreign territory” means an area—
   1. (A)over which no government or a government of a foreign country has sovereignty;
   2. (B)temporarily under military occupation by the United States Government; or
   3. (C)occupied or administered by the Government or a government of a foreign country under an international agreement.
4. (4)“territory outside the continental United States” means territory outside the 48 contiguous States and the District of Columbia.