Investigators trying to determine what caused last week’s deadly midair collision between a US military Black Hawk helicopter and an American Airlines plane near Washington, DC, briefed lawmakers Thursday on what they’ve learned after combing through data from both aircraft and air traffic control.

Mapped: How American Airlines plane collided with Black Hawk army helicopter near Washington DC airport - The two ‘black boxes’ have been recovered from the wreckage, with a cockpit voice recorder and

The National Transportation Safety Board is examining new data that may indicate the Black Hawk helicopter involved in a fatal midair collision with American Airlines Flight 5342 near Washington, D.C.