Full FAA Chronology at this link.
19400708: TWA employed the first flight engineer in U.S. scheduled domestic passenger service, on the Boeing 307B Stratoliner. The flight engineer took over system support functions, including the operation of the pressurization system, from the pilots. (See November 1, 1937 and July 10, 1945.)
19470708: The prototype Boeing 377 Stratocruiser first flew. The 377, an outgrowth of the military B29 Superfortress and the C-97 military transport, received its CAA type-certificate on September 3, 1948, and first saw service with Pan American World Airways on April 1, 1949. The plane had a spiral staircase leading down to a first class lounge in the lower fuselage. It could carry approximately 100 passengers or could be converted into a sleeper plane with 28 full-sized Pullman berths.
19710708: FAA put into operation a jet-propelled boat to conduct search and rescue operations in the event of a crash landing in the Potomac River near Washington National Airport.
This Day in FAA History: July 8th
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