747-400 United747 400 United Airlines airplane model. The 747 400 is the latest, longest ranging and best selling model of the 747 family. Boeing launched the 747 400 in October 1985 and the first development aircraft first flew on April 29, 1988. US certification (with PW 4000s) was awarded in January 1989. The 747 400 externally resembles the 300, but it is a significantly improved aircraft. Changes include a new, two crew digital flightdeck with six large CRT
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