On January 13, 1982, Air Florida Flight 90, a Boeing 737-222, was a scheduled flight to Fort Lauderdale, Florida, from Washington National Airport, Washington, D.C. There were 74 passengers and 5 crewmembers on board. The flight was delayed about 1 hour 45 minutes due to a moderate to heavy snowfall. Shortly after takeoff the aircraft crashed at 1601 e.s.t. into the 14th Street Bridge over the Potomac River and plunged into the ice-covered river, 0.75 nmi from the departure end of runway 36. Four passengers and one crewmember survived the crash. Four persons in the vehicles on the bridge were killed, four were injured. The National Transportation Safety Board determines that the probable cause of this accident was the flightcrew's failure to use engine anti-ice during ground operation and takeoff, and to take off with snow/ice on the airfoil surfaces of the aircraft. Contributing to the accident were the ground delay between de-icing and takeoff clearance.