NTSB, Greg Biffle
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The NTSB report revealed a troubling exchange between the pilot and air traffic control just minutes before impact.
After a yearlong investigation, the National Transportation Safety Board did not find a single cause for the deadly collision near Washington, D.C., but blamed the crash on multiple systemic failures.
Federal officials raise alarm about crowded airspace in Southern California.
NTSB Chair Jennifer Homendy said a series of "deep, underlying systemic failures" led to the midair crash between a passenger plane and Army helicopter that killed 67 people.
The NTSB accuses the FAA of a wide range of mistakes, both in the long, intermediate, and immediate term before the crash.
A pilot died when a personal flight crashed into a marsh near Sabine Pass, sparking an ongoing investigation into the cause by the NTSB.