Well spotted! Following.
PLANEFAGS
Did anyone else see the civilian flight squawking 7500 just now? I lost it when filtering.
UPDATE: Callsign UL212 Reg N441UA Belonging to USA Model 1977 AIRBUS INDUSTRIE A320-232 Flown by United Airlines is currently squawking 7500. Hijacking squawk detected.
The flight squawking 7500 is no longer able to be tracked by this planefag. Requesting assistance.
https://uk.flightaware.com/live/flight/N441UA
It's back, but squawking 6563 now (probably assigned by ACT?)
Currently over Bonita Springs (West florida). Named destination: Miami