Atlas flew the first Amazon flight (with a plane painted in the Amazon colours) a few days ago. Atlas got 20, ATSG (ABX and ATI) got 20, and I think Kalitta was offered 20, but that didn't work out...so Amazon has 20 more planes to farm out to someone.
Atlas sold its Florida West operation...that was acquired when Atlas bought Southern. FL West has it's own certificate. The rumour is Amazon bought it, so they could have their own airline...maybe they'll fly the other 20 planes themselves, with the FL West certificate...