Regulation of transportation of passengers and property by aircraft. Hearings before a subcommitte of the Committee on Interstate Commerce, United States Senate, Seventy-fifth Congress, first session, on S. 2, a bill to amend the Interstate commerce act, as amended, by providing for the regulation of the transportation of passengers and property by aircraft in interstate commerce, and for other purposes, and S. 1760, a bill to promote the safety of scheduled air transportation ... March 8 and 11, April 3, and 12, 1937