Civil Aeronautics Act amendment (security provisions) : hearing before the Committee on Interstate and Foreign Commerce, United States Senate, Eighty-first Congress, second session on S. 3995, a bill to amend the Civil Aeronautics Act of 1938, as amended, to authorize the Civil Aeronautics Board and the Secretary of Commerce to undertake security measures relative to the regulation and control of air commerce, and for other purposes, August 8, 1950