The NTSB has shared strong new airport surveillance video showing the separation of the left engine from the plane.
Questions remain as the NTSB investigates the deadly plane crash that killed former NASCAR driver Greg Biffle and his family
A small plane crashed after taking off from DuPage Airport in West Chicago Wednesday afternoon, the Federal Aviation Administration said.
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.
During the second of three days of witness testimony and public inquiry by the National Transportation Safety Board into the January midair crash over the Potomac River, the board focused on air traffic control.