1997: The Pathfinder RPV sets a new world record for high-altitude flight by a solar powered aircraft, reaching 67,350 ft. This flight to the highest altitude ever reached by a propeller-driven aircraft took place at the Pacific Missile Range Facility at Kauai, Hawaii.
1950: The 28th Strategic Reconnaissance Wing at Rapid City AFB, South Dakota receives the first RB-36D (number 44-92091). This reconnaissance version of the B-36B had four jet engines added to the six propeller engines. (Stock RB-36D photo)
1934: Army Air Corps airmail operations end. The official record for the brief enterprise reflects 57 crashes and 12 fatalities (the main reason for ending the program), with 1.5 million miles flown to carry 777,000 pounds of mail at a cost of $2.7 million.