Aircraft transponder showing squawk code 7700 in cockpit.

Squawk Codes 7500, 7600 and 7700: What They Mean in Aviation

Squawk codes 7500, 7600 and 7700 can silently tell air traffic control that an aircraft is facing unlawful interference, a radio failure or a general emergency. Here is what each code means, what controllers see and what happens next.

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