A secretive mission will pass a quiet milestone at the end of this month when the U.S. Air Force’s unmanned spaceplane the X-37B surpasses 500 days in space.
A day of firsts: The Brooklyn Dodgers become the first baseball team to buy a plane, Pan Am launches the first all-cargo transatlantic service, a pope flies on a plane for the first time, Sputnik 1, the first satellite, falls o...