Why are some planes tracked by satellite on Flightradar24?

Generally, satellite-based ADS-B increases coverage of flights over the ocean where ground-based reception is not possible.

What happens if you squawk 7777?

Under normal circumstance even interception missions are supposed to work with ATC. Squawking 7777 is sort of a last resort thing for the DoD to tell ATC to get out of their way and get everything else out of their way.

Why are there blue planes on FlightRadar24?

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