DC plane crash updates: Remains of 55 victims recovered and positively identified

Unified Command provided an update Saturday afternoon on its recovery and salvage operations in the Potomac River.

"The Black Hawk helicopter was briefly stabilized with a crane to assist in recovery efforts, however, it has not been removed from the water," it said in a statement.

No wreckage is expected to be raised for the rest of the day, according to Unified Command.

Additionally, officials said 42 sets of remains and 38 have been positively identified by the DC Office of the Chief Medical Examiner.

-ABC News' Victor Ordonez

The DCA air traffic controller who was working at the time of the collision has been interviewed, NTSB member Todd Inman said during the briefing.

"His interviews are ongoing throughout the day," Inman said.

Part of the NTSB's investigation will entail looking at the hiring and training of any air traffic controllers involved in the incident, he said.

"We'll go back and look at their past, probably, 72 hours, even two or three weeks," he said. "We'll look at their training, their hiring, everything. What they probably ate that day."

"But it is not one point that tells us everything. It's layered into a lot of other information that's very critical," he continued.

Investigators will also look at ATC staffing and job functions.

"Obviously, we'll be looking at not only staffing that day, but progressively staffing. How many people, what job functions they were doing? Were they being combined? Were they not?"

The Black Hawk's black box -- a combined cockpit voice recorder and digital flight data recorder -- has been recovered in good condition, NTSB member Todd Inman said during a briefing.

The jet's two black boxes were recovered on Thursday. The flight data recorder was found to be in good condition, while the cockpit voice recorder had water intrusion, which is not uncommon, Inman said during the briefing.

Inman said they have high confidence they will be able to extract data from all three black boxes.

Barges are en route to the crash site and should be on site early Saturday morning to help salvage the aircraft debris, NTSB Member Todd Inman said during a briefing.

"After their arrival, they will be secured and located, and then significant salvage operations will continue," he said. "They are ongoing right now, but this will be the main lifting."