Black Hawk, NTSB and American Airlines

The U.S. Army helicopter that collided with an passenger jet near Washington, D.C., had an advanced surveillance system ...
A key safety system was turned off in a US army helicopter when it crashed into an American Airlines flight last week, ...
Investigators trying to figure out what led to the deadly midair collision between a US military Black Hawk helicopter and an ...
Readings have been compared from the black box recovered from American Eagle flight 5342 and the air traffic control tower ...