49 C.F.R. § 1511.3
The following definitions apply for purposes of this part. For other definitions that may be applicable to this part refer to 49 U.S.C. 40102 .
Administrator means the Administrator of the Transportation Security Administration or the Administrator's designee.
Air transportation means the carriage by passenger aircraft of persons or property for compensation or hire in intrastate air transportation, interstate air transportation, or foreign air transportation.
Aircraft means a device that is used or intended to be used for flight in the air.
Fiscal year means the fiscal year for the Federal government, which begins each year October 1 and ends on September 30. The fiscal year is designated by the calendar year in which it ends, e.g., fiscal year 2002 is the year beginning October 1, 2001, and ending September 30, 2002.
Foreign air transportation means air transportation between a place in the United States and any place outside of the United States.
Interstate air transportation means air transportation within the United States.
Intrastate air transportation means air transportation wholly within the same State of the United States.
Passenger aircraft means an aircraft that is used to transport passengers in air transportation.
Property means mail, cargo, carry-on and checked baggage, and any other articles transported by passenger aircraft operated by an air carrier or foreign air carrier in air transportation, but excluding property transported under the "Known Shipper Program."
49 C.F.R. §1511.3