[RoughDobermann]

This could be as simple as the owner reclaiming his property.

Yes, that's entirely plausible.

[NYFriend]

"the men in the control tower radioed the pilot for an explanation. There was no reply from the cockpit, even after the plane rumbled to a takeoff into the African skies."

Simplest explaination, there was no pilot. After 14 months in Angola, the plane had enough and decided to try and find its own way home to the Boieng HQ in St. Louis, where it hatched many years ago. Doesn't happen often, but you see stuff like this once in a while. Move along, nothing to see here.

[Arkie2]

http://www.pprune.org/forums/showthread.php?s=&threadid=91494

If you want to read some good speculation about this incident check out the link above. Most think it's a repo. Also some detail about those fuel tanks.