Over fifty years ago, on February 9, 1969, Boeing changed commercial aviation history with the first flight of the world's most recognizable airplane -- the 747. Known as the "Queen of the Skies," the 747 has carried 3.6 billion people more than 35 billion nautical miles (64.8 billion km) -- equivalent to 74,000 round trips to the Moon -- since entering service in 1970.