What twinjet with rear-mounted engines and swept wings did I see in Savannah, GA?
Gulfstream G500. The G600 is longer. The angle is close, but look at the window just ahead of the wing fairing. The original is faint but clearly ahead of the fairing curve. The G600 window is in the middle of the curve. The G600 has a bigger wing.



G500 pinterest



G600 wikipedia