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.

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.”

Air Florida Flight 90 crashed into the 14th Street Bridge over the Potomac River. 78 passengers, cabin crew members and motorists died. Just five people survived, and only three are still alive to witness news of the American Airlines plane that collided with a U.

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.

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.

US airlines had gone 16 years without a fatal crash until Wednesday night. But as impressive as that safety record had been, there have been warning signs in recent years of a significant risk of a collision like the one that just killed 67 people.

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.