Using radio traffic, flight data and leaked footage of an air traffic control radar screen, we examine what was happening in the moments before the midair collision near Reagan National Airport that ...

Newly released data from ground-based radar came out Tuesday suggesting an Army helicopter was higher than it was supposed to ...

Footage of an air traffic control room screen shows the radar view of an American Airlines plane colliding with a military helicopter. Officials say no one is believed to have survived ...

RESCUERS searching for a missing plane that vanished off the coast of Alaska have found an aircraft matching its description, ...

The research that went into improving radar ... in the air. The rectifier's job was to translate the reflected signal into the direct current necessary for visualization on the screen.