While landing at Ronald Reagan Washington National Airport in Washington, D.C., on Wednesday shortly before 9 p.m., American Airlines Flight 5342 collided with an Army Black Hawk helicopter and crashed into the icy Potomac River.

The last major collision of a commercial U.S. airline dates back to 2009, when a Colgan Air incident left 50 dead near Buffalo, New York. Federal regulators tightened safety requirements following the crash, including bolstering aircraft carrier inspection requirements and pilot training hours.

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Authorities are investigating how two aircraft crashed in mid-air despite normal flight patterns and communications.

A number of figure skaters, their coaches and family members were on board the flight returning home from a training camp in Wichita, Kan., U.S. Figure Skating said. + Former world figure-skating cham