April 6, 1912 Harriet Quimby is the first woman to fly across the English Channel.
April 39, 1917 Pacific Aero Products changes its name to Boeing Aircraft Co. President-William E. Boeing
April 20, 1930 Charles and Anne Morrow Lindbergh set a transcontinental speed record from Los Angeles to New York in 14 hours, 45 minutes.
April 8, 1931 Amelia Earhart sets an altitude record of 19,451 ft in the Pitcairn autogyro.
April 27, 1947 United Airlines unveils the Douglass DC-6.
April 15, 1952 Boeing’s B-52 Stratofortress takes its first flight.
April 19, 1971 The first manned spacelab, Salyut 1, launches.
April 4-9, 1983 First flight of the Challenger space shuttle.
April 27, 1995 GPS (Global Positioning System) is fully operational.
April 29, 2005 Kennedy Space Center (Fl) launches the last Titan 4 rocket.
-Source, AOPA magazine, April 2015 issue