14 CFR § 244.2 - Applicability.
(a) Covered operations. Except as provided in paragraph (b) of this section, this part applies to U.S. certificated air carriers, U.S. commuter air carriers and foreign air carriers that operate passenger service to or from a U.S. airport with at least one aircraft that has an original manufacturer's design capacity of 30 or more seats. Covered carriers must report all passenger operations that experience an excessive tarmac delay at a U.S. airport.
(b) Exceptions.
(1) For foreign air carriers that operate charter flights from foreign airports to U.S. airports, and return to foreign airports, and do not pick up any new passengers in the United States, the charter flights are not flights subject to the reporting requirements of this part.
(2) For U.S. air carriers whose flights are reported under 14 CFR part 234 (Airline Service Quality Performance Reports), their scheduled domestic flights are not subject to the reporting requirements of this part.