• Aeromexico Flight 665, a Boeing 737-752, registration XA-NAM, suffers a nosewheel collapse on pushback at San Francisco International Airport. The aircraft is substantially damaged. - 21st July 2009
  • A United States Navy Sikorsky HH-60H 163790 crashed on a training flight at Fort Pickett, Blackstone, Virginia, United States; minor injuries only. - 21st July 2009
  • A U.S. Air Force Boeing B-52H-155-BW Stratofortress, 60-0053, c/n 464-418, "Louisiana Fire", crashed into the Pacific Ocean approximately 25 nautical miles (46 km) northwest of Apra Harbor, Guam, after taking off from Andersen Air Force Base. The aircraft was about to participate in a flyover for the Liberation Day parade in Hagatna when it crashed at 9:45 AM ChST (2345 UTC), 15 minutes before the parade was scheduled to start. There were no survivors. - 21st July 2008
  • (21-26) The 17th FAI World Precision Flying Championship is held in Troyes, France. Individual winners are 1. Krzysztof Wieczorek (Poland) in a 3Xtrim, 2. Janusz Darocha (Poland) in a Cessna 152, 3. Krzysztof Skr?towicz (Poland) in a 3Xtrim. Team winners are 1. Poland, 2. Czech Republic, 3. France. - 21st July 2006
  • Two United States Marine Corps McDonnell-Douglas F/A-18 Hornets of VMFA-134, 3rd Marine Air Wing, based at MCAS Miramar, California, suffer mid-air collision over the Columbia River, 120 miles (190 km) E of Portland, Oregon, shortly after 1430 hrs., killing Marine Reservists Maj. Gary R. Fullerton, 36, of Spartanburg, South Carolina, and Capt. Jeffrey L. Ross, 36, of Old Hickory, Tennessee in F/A-18B, BuNo 162870, 'MF-00', coming down in the river. Maj. Craig Barden, 38, ejects from F/A-18A, BuNo 163097, 'MF-04', landing nearby on a hillside W of Arlington, Oregon, and is taken to Mid-Columbia Medical Center in The Dalles, suffering minor injuries. All three crew eject but only two parachutes open. The fighters were on their way to the Boardman Air Force Range, where the Oregon Air National Guard trains, when they collided, said one spokesman. Another spokesman told the Associated Press that the planes were on a low-altitude training exercise. - 21st July 2004
  • A South African registered aircraft, carrying 12 passengers and two crew, crashed into Mount Kenya: there were no survivors. - 21st July 2003
  • First flight of the XCOR EZ-Rocket - 21st July 2001
  • John Kevin Moorhouse, test pilot, dies at 50. - 21st July 1996
  • Eastern Airlines submits a reorganization plan to creditors. - 21st July 1986
  • The F-16 is officially named the Fighting Falcon in a ceremony. - 21st July 1980
  • The Libyan-Egyptian War begins. Egyptian Air Force planes shoot down two Libyan Air Force aircraft. - 21st July 1977
  • Canadian government announced that the Lockheed Aurora CP-140 maritime patrol aircraft would replace the Argus long-range patrol aircraft. - 21st July 1976
  • (21 – 28) Turkish Air Force strike aircraft mistakenly attack the Turkish Navy destroyers Kocatepe, Adatepe, and Mare?al Fevzi Cakmak off Paphos, Cyprus, with 750-lb (340-kg) bombs, sinking Kocatepe with the loss of 54 lives and damaging the other two ships. - 21st July 1974
  • (July 21 – August 12) Turkish paratroopers parachute into Cyprus to ambush a convoy carrying the Greek Cypriot commander of the Cypriot Navy, Commander Papayiannis. They wound him in an ambush, but are wiped out by his security detail. - 21st July 1974
  • In Operation Niki, the Hellenic Air Force attempts a covert airlift of a battalion of Greek commandos from Souda, Crete, to Cyprus using 15 Noratlas aircraft. Greek Cypriot antiaircraft artillery mistakenly fires on the planes at Nicosia International Airport, shooting down one with the loss of four crew members and 29 commandos, and damages two others, but some of the commandos arrive successfully to defend the airport. - 21st July 1974