Civil Aeronautics Act amendments : hearings before a subcommittee of the Committee on Interstate and Foreign Commerce, House of Representatives, Eighty-first Congress, first session on H.R. 4082, a bill to improve the administration of the Civil Aeronautics Act of 1938, and for other purposes : H.R. 2911, a bill to amend the Civil Aeronautics Act of 1938, to provide for the economic regulation of air carriers engaged in foreign air transportation, and for other purposes : H.R. 3940, a bill to amend the Civil Aeronautics Act of 1938, as amended, to regulate the transportation, packing, marking, and description of explosives and other dangerous articles, May 5, 10, 11, 12, and 20, 1949