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Happened as dated, per en.wikipedia.org[1]: "The 747’s first flight took place on February 9, 1969, and the 747 was certified in December 1969."The first Jumbo Jet flew from Paine Field with test pilots Jack Waddell and Brien Wygle at the controls. Despite a minor flap problem the flight confirmed the 747 handled well and was largely immune to the Dutch roll that had plagued early swept-wing jets.
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