Full FAA Chronology at this link.
19300429: The Watres Act further amended the Air Mail Act of 1925 (see May 17, 1928), replacing the weight basis for computing compensation to air carriers with a space-mile formula. The new act gave the Postmaster General very broad regulatory control over route locations, route consolidations and extensions, contract bidding conditions, service conditions, equipment and personnel accounts, and compensation. (See May 19, 1930.)
19370429: The Commerce Department announced a new plan of organization for the Bureau of Air Commerce.