Footage of an air traffic radar screen shows the American Airlines flight making a routine landing when the US military Black ...

The transponder concept is based on a two-antenna design ensuring a small time delay between reception and re-transmission of the radar signal. Furthermore the complete electronic and both antennas ...

Footage of an air traffic control room screen shows the radar view of an American Airlines plane colliding with a military helicopter.

The transponder then continually transmits this ... data as a unique identifier on an air traffic controllerâ s radar screen. The simple technology that grants ATC access to a flight's ...