Pilots of an Army helicopter that collided with a passenger jet near DC airport didn't know how high they were flying because of altimeter discrepancies.

Flight instruments probably led the Black Hawk crew to believe the helicopter was lower than it actually was before the ...

Investigators testifying at a hearing into the January's mid-air crash in Washington DC suggest faulty altitude data may have ...

The National Transportation Safety Board will hold three days of hearings starting Wednesday on January’s midair collision between an American Airlines passenger jet and an Army helicopter over the ...