Full FAA Chronology at this link.
19370428: The Pan American Hong Kong Clipper, a Sikorsky S-42B flying boat, arrived at Hong Kong from Manila. Linking with the existing Pan Am route from San Francisco to Manila, this new service completed the first commercial airline route from the United States to a point close to the Asian mainland. (See October 21, 1936.)
19670428: The McDonnell Douglas Corporation came into being, the result of a merger between the Douglas Aircraft Company and the McDonnell Company. Douglas had been founded in 1920, McDonnell in 1939.