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.

"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

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

An Army Black Hawk helicopter collided with a regional jet near Ronald Reagan Washington National Airport on Wednesday evening, U.S. officials confirmed to ABC News.

National Transportation Safety Board Chair Jennifer Homendy said Thursday at a press conference that “we look at facts on our investigation and that will take some time.”

American Airlines CEO Robert Isom on Thursday morning expressed his condolences to the family and loved ones of those aboard a flight that collided with a military helicopter Wednesday night.

A family with Georgia ties is grieving after learning their loved one was one of the pilots killed in the crash between a small American Airlines plane and a military helicopter crash near Reagan National Airport.

The National Transportation Safety Board (NTSB) has recovered the cockpit voice and flight data recorders after an American Airlines plane and military helicopter collided near Reagan National Airport (DCA).

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

The crash, resulting in 67 lives lost, is the deadliest aviation incident in the United States since 2001. It ends a yearslong accident-free run for the country’s commercial flight industry.