American Airlines CEO Robert Isom said the National Transportation Safety Board, which is investigating the deadly midair collision between an American passenger jet and a military helicopter, will be the lone authority on the cause and details of the crash.

No chute or slides appeared to be deployed from the American Airlines plane, according to J. Todd Inman, a member of the National Transportation Safety Board. “It was a very quick, rapid impact,” he said.

DALLAS — Investigators from the National Transportation Safety Board will likely be studying three main elements as they try to pinpoint the cause of the mid-air collision between American Airlines Flight 5342 and the U.S. Army helicopter on Wednesday night.

Sixty passengers and four crew members from the plane and three Black Hawk helicopter personnel are feared dead as a recovery mission is underway.

American Airlines CEO Robert Isom shared a letter to all employees sharing updates and resources following the deadly mid-air collision.

No survivors are expected, authorities said Thursday, after a commercial flight and a helicopter collided in midair Wednesday night as the jet was about to land at Ronald Reagan National Airport in Washington,

The Post can reveal that miscommunications in one of the most crowded and complex patches of sky in the US are likely to blame.

An American Airlines jet carrying 64 people collided Wednesday with a helicopter near Reagan Washington National Airport, with no survivors expected.

"We’re here to assure the American people that we are going to leave no stone unturned in this investigation," said an NTSB official said

An Army Black Hawk helicopter collided midair with an American Airlines flight from Wichita, Kansas, at Reagan National Airport on Wednesday.

The National Transportation Safety Board gives an update and answers questions about the deadly plane crash involving a passenger plane and a military helicopter.