U. S. Centennial of Flight - History of Flight

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Images from: Aerospace Industry

	O-2 observation biplane Credit - Boeing
	Dolphin military amphibian Credit - Boeing
	Douglas observation monoplanes Credit - Boeing
	DC-1 wings being tested Credit - Boeing
	DC-1 ailerons being tested Credit - Boeing
	DC-1 monoplane Credit - Boeing
	DC-2 plane Credit - Boeing
	Flight attendants were nurses Credit - Boeing
	United flight attendants Credit - United Air Lines photo