A preliminary analysis of the flight data and voice recorder on board a Black Hawk helicopter leading up to the collision with a commercial flight over Washington, DC, on January 29, indicated the helicopter’s altimeter may have been inaccurate and the pilots may not have heard some calls from the Reagan National Airport control tower,

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

Investigators probing the deadly collision between a U.S. Army Black Hawk helicopter and an American Airlines jet near Washington, D.C.'s Ronald Reagan National Airport on January 29 have determined that the helicopter crew may have missed crucial air traffic control instructions and received inaccurate altitude data in the moments leading up to the crash.