This Day in Failure: March 23

2011: Two passenger jets, an American Airlines Boeing 737 with 97 people on board, and a United Airlines Airbus A320 with 68 individuals on board, land without air traffic controller assistance at Reagan National Airport (DCA) in Arlington, Virginia, after the lone controller on the midnight shift falls asleep while on duty. The incident prompts the Federal Aviation Administration to launch a nationwide inquiry into tower staffing issues.

1983: The first recipient of an artificial heart—Barney B. Clark—dies 112 days after his transplant operation.