Greg Biffle, NTSB
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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.
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.
Preliminary report outlines instrument problems and crew qualifications in the December accident.
Federal officials raise alarm about crowded airspace in Southern California.
A pilot died when a personal flight crashed into a marsh near Sabine Pass, sparking an ongoing investigation into the cause by the NTSB.
The NTSB accuses the FAA of a wide range of mistakes, both in the long, intermediate, and immediate term before the crash.