Event:
Flight readiness firing of Atlantis' main engines; 20 seconds
More Notable Events on September 12:
1994 Cessna crashes in White House front yard
1984 New York Met Dwight Goodin sets rookie strike out record at 251
1970 1st Concorde lands at Heathrow airport
1953 Senator John F. Kennedy, 36, marries Jacqueline Bouvier, 24
1944 U.S. Army troops entered Germany for 1st time
