1939
AIRLINES OF THE U.S.
For their high record of safety in air travel, with special recognition to Drs. Walter M. Boothby and W. Randolph Lovelace, II of the Mayo Foundation for Medical Education and Research and Captain Harry G. Armstrong of the U. S. Army Medical Corps at Wright Field, for their contribution to this safety record through their work in aviation medicine in general and pilot fatigue in particular.
1938
HOWARD HUGHES AND HIS ASSOCIATES
For their epoch making round the world flight in 91 hours and 14 minutes.
1937
U. S. ARMY AIR CORPS
For developing, equipping and flying the first successful pressure cabin airplane, the XC-35.
1936
PAN AMERICAN AIRWAYS
For the establishment of the trans-Pacific airplane and the successful execution of extended overwater navigation in the regular operation thereof.
1935
DONALD W. DOUGLAS AND HIS TECHNICAL AND PRODUCTION PERSONNEL
For outstanding twin-engined transport airplane.
1934
CAPTAIN A. F. HEGENBERGER, U. S. ARMY AIR CORPS
For development of a successful blind landing system.
1933
HAMILTON STANDARD PROPELLER COMPANY AND FRANK WALKER CALDWELL, CHIEF ENGINEER
For controllable pitch propeller.
1932
GLENN L. MARTIN
For development of a high-speed weight-carrying airplane.
1931
PACKARD MOTOR CAR COMPANY
For development of the diesel aircraft engine.
1930
HAROLD F. PITCAIRN AND HIS ASSOCIATES
For development and application of the autogiro.
