December 21, 1926 Maj. Herbert A. Dargue led a Pan Am goodwill flight from San Antonio around South America, to Washington, D.C. For the 22,065-mile flight. Major Dargue used five Loening Amphibians with 420-horsepower Liberty engines. On May 2, 1927, four aircraft and eight of 10 aviators (including Capt. Ira C. Eaker and 1st Lt Muir S. Fairchild) completed the flight. They received the Mackay Trophy and Distinguished Flying Crosses for their effort. The other plane crashed in Argentina, killing the crewmen.
December 21, 1944 Gen. Henry H. Arnold became a five-star General of the Army and the first Airman to hold this rank.
December 21, 1950 Boeing delivered the first KC-97A Stratofreighter to the. Air Force. The company unveiled the first C-97 model converted to a tanker-transport earlier in the month. The KC-97A, a propeller-driven, four-engine aircraft, had a flying boom and four added fuselage tanks with a 14,990-gallon capacity.
December 21, 1959 Gen. Thomas S. Power accepted the first production-model Hound Dog guided air-to-surface missile at North American Aviation's plant in Downey for the Air Force.