Readings have been compared from the black box recovered from American Eagle flight 5342 and the air traffic control tower about the Black Hawk helicopter

Preliminary flight data from the deadly plane crash near Reagan National Airport in Washington, D.C., shows conflicting readings about the altitudes of a passenger jet and Army helicopter that collided,

Preliminary data from crash between an airliner and an Army helicopter show conflicting indications on the aircrafts’ altitudes as they collided, officials say.

Investigators hope to reconcile the altitude differences with data from the helicopter’s black box, which is taking more time to retrieve because it was waterlogged.