 This changed situation resulted from the new post-war approach the Civil Aeronautics Board (CAB) took toward the promotion of competition between major US carriers on key domestic and international scheduled routes compared with pre-war US aviation policy.AOA was the first airline to begin regular landplane flights across the Atlantic, on October 24, 1945.In January 1946 Pan Am scheduled seven DC-4s a week east from LaGuardia Airport, five to London (Hurn Airport) and two to Lisbon.