Hi All,
I can shed some light on this for you, as i worked for Excel Airways for 2 years (operations).
The aircraft is indeed an Air Atlanta 747 classic and is operated by none other than Air Atlanta!! on behalf of Excel Aviation and on most occasions took on Air Atlanta flight numbers (ABD), however did at one point operate under XLA, for various sub charters.
This is not an uncommon site at Excel as they until the begining of the year had an Azzurair A320 operating flights for them again for Excel Aviation, until Azzurair stop operating, it then i beleive went to Air Malta
One could say that they have there fingers firmly in every pot!!!
Good Luck All at XLA with the Summer!!