Air Florida Flight 90

Air Florida Flight 90 was a scheduled domestic passenger flight operated from Washington National Airport (now Ronald Reagan Washington National Airport) to Fort Lauderdale–Hollywood International Airport, with an intermediate stopover at Tampa International Airport. On January 13, 1982, the Boeing 737-200 that executed the flight, registered as N62AF, crashed into the 14th Street Bridge over the Potomac River just after takeoff from Washington National Airport.

Striking the bridge, which carries Interstate 395 between Washington, D.C., and Arlington County, Virginia, it hit seven occupied vehicles and destroyed of guard rail before plunging through the ice into the Potomac River. The aircraft was carrying 74 passengers and five crew members. Only four passengers and one crew member (flight attendant Kelly Duncan) were rescued from the crash and survived. Another passenger, Arland D. Williams Jr., assisted in the rescue of the survivors, but drowned before he could be rescued. Four motorists on the bridge were killed. The survivors were rescued from the icy river by civilians and professionals. President Ronald Reagan commended these acts during his State of the Union speech 13 days later.

The National Transportation Safety Board (NTSB) determined that the cause of the accident was pilot error. The pilots failed to switch on the engines' internal ice protection systems, used reverse thrust in a snowstorm prior to takeoff, tried to use the jet exhaust of a plane in front of them to melt their ice, and failed to abandon the takeoff even after detecting a power problem while taxiing and ice and snow buildup on the wings. Provided by Wikipedia