Pan Am Flight 103 was a regularly scheduled Pan Am transatlantic flight from Frankfurt to Detroit via a stopover in London and another in New York City. The transatlantic leg of the route was operated by Clipper Maid of the Seas, a Boeing 747-121 registered N739PA. Shortly after 19:00 on 21 December 1988, while the aircraft was in flight over the Scottish town of Lockerbie, it was destroyed by a bomb that had been planted on board, killing all 243 passengers and 16 crew in what became known as the Lockerbie bombing. Large sections of the aircraft crashed in a residential street in Lockerbie, killing 11 residents. With a total of 270 fatalities, it is the deadliest terrorist attack in the history of the United Kingdom, as well as its deadliest aviation disaster.