Divers are expected to return to the Potomac River as part of a recovery and investigation after a mid-air collision killed 67 people in the US’s deadliest aviation disaster in almost a quarter of a century.
Investigators have already recovered the cockpit voice recorder and flight data recorder of the American Airlines plane that collided with an Army helicopter as the plane was landing on Wednesday night at Ronald Reagan National Airport next to Washington DC.
Officials are scrutinising a range of factors in what National Transportation Safety Board chairwoman Jennifer Hommendy has called an “all-hands-on-deck event”.
All aboard the two aircraft were killed, with officials examining the actions of the military pilot as well as air traffic control after the helicopter apparently flew into the path of the American Airlines jet.
More than 40 bodies have been pulled from the Potomac River as a massive recovery effort continues following the deadliest aviation disaster in a generation, a law enforcement official told The Associated Press.
Boats work at the scene in the Potomac River near Ronald Reagan Washington National Airport (Petty Officer 2nd Class Taylor Bacon/AP)
The recovery efforts were continuing on Friday.
The official was not authorised to discuss details of the investigation and spoke on condition of anonymity.
Air crash investigations can take months, and investigators told reporters on Thursday they would not speculate on the cause.
Authorities were still looking for the helicopter’s black box recorder, Defence Secretary Pete Hegseth said Friday on Fox News Channel.
Other factors in the crash, including the helicopter’s altitude and whether the crew was using its night vision goggles, are still under investigation, Mr Hegseth said.
Wreckage is seen in the Potomac River near Ronald Reagan Washington National Airport (US Coast Guard via AP)
One air traffic controller was responsible for coordinating helicopter traffic and arriving and departing planes when the collision happened, according to a report by the Federal Aviation Administration that was obtained by AP.
Those duties are often divided between two people, but the airport typically combines the roles at 9.30pm, once traffic begins to slow down.
On Wednesday the tower supervisor directed that they be combined earlier.
“The position configuration was not normal for the time of day and volume of traffic,” the report said.
A person familiar with the matter, however, said the tower staffing that night was at a normal level.
The positions are regularly combined when controllers need to step away from the console for breaks, during shift changes or when air traffic is slow, the person said, speaking on the condition of anonymity to discuss internal procedures.
The FAA has long struggled with a shortage of air traffic controllers.
Officials said flight conditions were clear as the jet arrived from Wichita, Kansas, carrying, among others, a group of elite young figure skaters, their parents and coaches, and four union steamfitters from the Washington area.
Investigators examine the cockpit voice recorder and flight data recorder recovered from the passenger jet that crashed with an army helicopter (AP)
A top army aviation official said the crew of the helicopter, a Black Hawk, was “very experienced” and familiar with the congested flying that occurs daily around the city.
“Both pilots had flown this specific route before, at night. This wasn’t something new to either one of them,” said Jonathan Koziol, chief of staff for army aviation.
The helicopter’s maximum allowed altitude at the time was 200 feet (about 60 meters), Mr Koziol said.
It was not immediately clear whether it exceeded that limit, but Mr Hegseth said altitude seemed to be a factor in the collision.
Pastor Bob Becker takes part in a prayer vigil held in Wichita, Kansas for those affected by the crash (Travis Heying/AP)
Mr Koziol said investigators need to analyse the flight data before making conclusions about altitude.
Flights at Reagan National resumed around midday on Thursday.
Wednesday’s crash was the deadliest in the US since November 12, 2001, when an American Airlines flight slammed into a residential area of Belle Harbour, New York, just after take-off from Kennedy Airport, killing all 260 people aboard and five people on the ground.
The last major fatal crash involving a US commercial airline occurred in 2009 near Buffalo, New York.
Everyone aboard the Bombardier DHC-8 propeller plane was killed, along with one person on the ground, bringing the total death toll to 50.
Experts often highlight that plane travel is overwhelmingly safe, however.
The National Safety Council estimates that Americans have a 1-in-93 chance of dying in a motor vehicle crash, while deaths on airplanes are too rare to calculate the odds.