Air Atlanta are flying charters out of UK Airports using their 747's, as many have stated. TF-ATC is based at Manchester at the moment, and I think there are some others elsewhere, so that could well be what you saw at Gatwick as they are not in the Atlanta livery, they are just all white. Does anybody know if they are flying for a holiday company, or what?
Also, does anyone know what happened to the Air Atlanta Tri-stars you used to see in the UK about 2 or 3 years ago? Are they still with Air Atlanta? I haven't seen one in the UK for some time.
Cheers,
Landing_24R