Watched a History Channel documentary last night, about Samuel Byck. Very interesting.
Way back in 1974, Mr. Byck decided to assassinate Richard Nixon, by hijacking an airliner and crashing it into the White House. He managed to shoot his way onto an airplane, but never got it off the ground. He committed suicide after being wounded by a police officer.
(It seems the History Channel special was a ripoff of a 2004 movie, The Assassination of Richard Nixon, which itself would never have been made if not for the terrorist attacks of September 11, 2001.)