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Q. What information does a transponder send, and who does it send it to?
A transponder is a radio transmitter in the cockpit that works with ground radar. When the transponder receives a signal from a more sophisticated ground "secondary" radar, it returns a squawk code with the aircraft's position, its altitude and its call sign. It is constantly being radar pinged, helping air traffic controllers on the ground determine the airplane's speed and direction, too.
Q. What does "squawk" mean?
It's a four-digit identifying code that the pilot enters into a transponder for each flight. It helps air traffic control recognize each plane.
Did someone suggest that?
OK thanks. So they allegedly flew thru that cluster of radar coverage undetected? Is that what's being suggested?