Air carrier certificates, Alaska and Hawaii : Hearings before the United States House Committee on Interstate and Foreign Commerce, Subcommittee on Transportation and Communications, Eighty-fourth Congress, second session, on H.R. 9252, a bill to amend section 401 (e) of the Civil aeronautics act of 1938 in order to authorize permanent certification for certain air carriers operating in Hawaii and Alaska and H.R. 9253, a bill to amend section 401 (e) of the Civil aeronautics act of 1938 in order to authorize permanent certification for certain air carriers operating between the United States and Alaska, on Mar. 28, 29, 1956.