49 USC 41101 – Requirement for a certificate
(a)
(1) an air carrier may provide air transportation only if the air carrier holds a certificate issued under this chapter authorizing the air transportation;
(2) a charter air carrier may provide charter air transportation only if the charter air carrier holds a certificate issued under this chapter authorizing the charter air transportation; and
(3) an air carrier may provide all-cargo air transportation only if the air carrier holds a certificate issued under this chapter authorizing the all-cargo air transportation.
(b)
(1) may provide transportation for passengers and property that includes through service by the citizen over its routes in the State and in air transportation by an air carrier or foreign air carrier; and
(2) subject to sections 41309 and 42111 of this title, may make an agreement with an air carrier or foreign air carrier to provide the joint transportation.
(c)