NTSB says the remains of several geese were found on the wreckage of a New York City sightseeing helicopter that crashed into the Hudson River last year and killed 6 people.
The chair of the NTSB expressed concern over the possibility of a mid-air collision at the Burbank Airport.
The air traffic controller who was managing numerous aircraft around Reagan National Airport felt a "little overwhelmed" just a few minutes before an American Airlines jet collided midair with an Army helicopter near Washington D.C., an investigator said.
Questions remain as the NTSB investigates the deadly plane crash that killed former NASCAR driver Greg Biffle and his family
All 67 people on board Flight 5342 and the helicopter were killed when they collided as the jet approached Reagan National.
The NTSB concluded three days of investigative hearings on Friday.