Government aircraft - An aircraft that is operated for the exclusive use of an executive agency and is a -
(a) Federal aircraft, which an executive agency owns (i.e., holds title to) or borrows for any length of time under a bailment or equivalent loan agreement. See 41 CFR 102-33.20 for definition of all terms related to Federal aircraft, or
(b) Commercial aircraft hired as commercial aviation services (CAS), which an executive agency -
(1) Leases or lease-purchases with the intent to take title,
(2) Charters or rents, or
(3) Hires as part of a full-service contract or inter-service support agreement (ISSA).