14 CFR 255.3 - Definitions.
Carrier means any air carrier, any foreign air carrier, and any commuter air carrier, as defined in 49 U.S.C. 40102(3), 49 U.S.C. 40102(22), and 14 CFR 298.2(f), respectively, that is engaged directly in the operation of aircraft in passenger air transportation.
On-time performance code means a single-character code supplied by a carrier to the system in accordance with the provisions of 14 CFR Part 234 that reflects the monthly on-time performance history of a nonstop flight or one-stop or multi-stop single plane operation held out by the carrier in a CRS.
Participating carrier means a carrier that has an agreement with a system for display of its schedules, fares, or seat availability, or for the making of reservations or issuance of tickets through a system.
Subscriber means a ticket agent, as defined in 49 U.S.C. 40102(40), that holds itself out as a source of information about, or reservations for, the air transportation industry and that uses a system.
System means a computerized reservations system offered to subscribers for use in the United States that contains information about schedules, fares, rules or availability of carriers and provides subscribers with the ability to make reservations, if it charges any carrier a fee for system services. It does not mean direct connections between a ticket agent and the internal reservations systems of individual carriers.