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 ...

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.

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 ...

The airport's air traffic control screen — relying on radar sensors and other data — had it at 300 feet (91 meters), the agency said. However that figure would have been rounded to the nearest 100 ...