Domestic type operation means any domestic operation conducted with-
Flag type operation means any flag operation conducted with-
Supplemental type operation means any supplemental operation (except an all-cargo operation) conducted with an airplane designed for at least 31 passenger seats (as determined by the aircraft type certificate issued by a competent civil aviation authority) at any land airport in any State of the United States, the District of Columbia, or any territory or possession of the United States.
United States means the States of the United States, the District of Columbia, and the territories and possessions of the United States.
14 C.F.R. §121.590
Special Statutory Requirement to Operate to or From a Part 139 Airport. Each air carrier that provides-in an aircraft (e.g., airplane, rotorcraft, etc.) designed for more than 9 passenger seats-regularly scheduled charter air transportation for which the public is provided in advance a schedule containing the departure location, departure time, and arrival location of the flight must operate to and from an airport certificated under part 139 of this chapter in accordance with 49 U.S.C. 41104(b) . That statutory provision contains stand-alone requirements for such air carriers and special exceptions for operations in Alaska and outside the United States. Nothing in §121.590 exempts the air carriers described in this note from the requirements of 49 U.S.C. 41104(b) . Certain operations by air carriers that conduct public charter operations under 14 CFR part 380 are covered by the statutory requirements to operate to and from part 139 airports. See 49 U.S.C. 41104(b) .