Old RAF bird. Plenty of those in private collections, one in Miami https://www.thunder-and-lightnings.co.uk/hunter/survivors.php

But tracking them you can see they took off from Jacksonville NAS, so probably are actually something else

Old RAF bird. Plenty of those in private collections, one in Miami https://www.thunder-and-lightnings.co.uk/hunter/survivors.php

Probable nothingburger but it's weird that his transponder would go dark.