The NTSB reported that missed air traffic messages and incorrect altitude data may have caused the Black Hawk helicopter-passenger jet crash.

The helicopter pilot and her instructor read aloud conflicting altitudes before the collision and some data appeared to investigators as faulty.

The NTSB has suggested that the Black Hawk crew may have missed a key instruction from air traffic controllers before the crash with an American Eagle flight.

The Black Hawk pilots who collided with an American Airlines plane last month may not have heard vital information given by air traffic control to fly behind the passenger jet seconds before the

The Black Hawk that collided with an American Airlines jet in January may not have had accurate altitude readings, investigators said.

The U.S. Army Black Hawk crew possibly didn't know there was an impending collision with a American Airlines jet in Washington, D.C., that resulted in the most deadly crash in the United States in 23 years.

The Black Hawk crashed into Flight 5342 just before 9 p.m. as the jet was en route to Reagan National Airport from Wichita, Kansas.