An NTSB investigation into a fatal helicopter-airplane collision in D.C. revealed a faulty helicopter altimeter and prior warnings to the FAA about helicopter traffic dangers. The NTSB criticized the FAA's inaction despite safety concerns and near misses.

The National Transportation Safety Board wrapped up a three-day investigative hearing into the mid-air collision between a helicopter and passenger jet in Washington that killed 67. New information confirms the crew of the Army helicopter faced several problems,

Three days of investigative hearings on the deadly midair collision over Washington in January begin Wednesday.