The jet carrying 64 people had departed from Wichita, Kan., and the helicopter was carrying three U.S. service members. The collision, which happened Wednesday evening near Ronald Reagan National Airport, was the most serious air disaster involving a commercial jet in the U.S. since 2009.

A deadly plane crash over the Potomac River near Washington, D.C. canceled flights to and from Ronald Reagan National Airport overnight. The airport reopened around 11 a.m. Thursday, as the search continues for the 64 people on board the American Airlines plane that collided with a U.

The plane was landing at the time of the crash, the AP said. At New York-area airports, most flights Thursday have been canceled to and from Reagan — three at Kennedy, 10 at LaGuardia and seven at Newark — according to the website flight aware.