# 1510.3 Definitions.
In addition to the definitions in §§ 1500.3, 1503.103, and 1540.5 of this chapter, the following terms are used in this part:
*Air carrier* means a citizen of the United States who undertakes directly to engage in or provide air transportation.
*Air transportation* means continental interstate air transportation, continental intrastate air transportation, foreign air transportation, non-continental interstate air transportation, or non-continental intrastate air transportation.
*Aircraft* means a device that is used or intended to be used for flight in the air.
*Airport* means any landing area used regularly by aircraft for receiving or discharging passengers or cargo.
*Continental interstate air transportation* means the carriage by aircraft of persons for compensation or hire within the continental United States.
*Continental intrastate air transportation* means the carriage by aircraft of persons for compensation or hire wholly within the same state of the continental United States.
*Continental United States* means the District of Columbia and the States other than Alaska and Hawaii.
*Co-terminal* means an airport serving a multi-airport city or metropolitan area that has been approved by TSA to be used as the same point for purposes of determining application of the security service fee imposed under § 1510.5 of this part. Copies of the approved list are available on TSA's Web site at *www.tsa.gov* or by contacting *[email protected].*
*Direct air carrier and foreign air carrier* means a selling carrier.
*Foreign air carrier* means any person other than a citizen of the United States who undertakes directly to engage in or provide air transportation.
*Foreign air transportation* means the carriage by aircraft of persons for compensation or hire between a place in the United States and any place outside of the United States.
*Frequent flyer award* means a zero-fare award of air transportation that a domestic air carrier or foreign air carrier provides to a passenger in exchange for accumulated travel mileage credits in a customer loyalty program, whether or not the term frequent flyer is used in the definition of that program.
*Non-continental interstate air transportation* means the carriage by aircraft of persons for compensation or hire within the United States, but outside the continental United States.
*Non-continental intrastate air transportation* means the carriage by aircraft of persons for compensation or hire wholly within the same state, territory or possession of the United States, but outside the continental United States.
*Nonrevenue passenger* means a passenger receiving air transportation from an air carrier or foreign air carrier for which the air carrier or foreign air carrier does not receive remuneration.
*One-way trip* means continuous air transportation, during which a stopover does not occur; there may be multiple one-way trips on the same air travel itinerary.
*Origin point* means the location at which a trip on a complete air travel itinerary begins.
*Principal* means the aggregate amount of all passenger security services fees due to be remitted to the Transportation Security Administration by an air carrier as required by this part.
*Round trip* means a trip on an air travel itinerary that terminates or has a stopover at the origin point (or co-terminal).
*Selling carrier* means an air carrier or foreign air carrier that provides or offers to provide air transportation and has control over the operational functions performed in providing that air transportation.
*Stopover* means a break in travel of more than:
(1) Four (4) hours for continental interstate air transportation or continental intrastate air transportation, and
(2) Twelve (12) hours for non-continental interstate air transportation, non-continental intrastate air transportation, or foreign air transportation.
*Terminates* means the location at which a trip on a complete air travel itinerary ends.
[66 FR 67701, Dec. 31, 2001, as amended at 68 FR 49720, Aug. 19, 2003; 79 FR 35473, June 20, 2014; 80 FR 31857, June 4, 2015]