14 C.F.R. § 249.1
Applicability
Subparts A and B of this part apply to:
(a) Air carriers, as defined in 49 U.S.C. 40102, that hold either certificates of public convenience and necessity or certificates for all-cargo air service.
(b) Public charter operators, as defined in part 380 of this chapter.
(c) Overseas military personnel charter operators, as defined in part 372 of this chapter.