We have a rather dasting flight out of ATL scheduled for tomorrow. I've been watching this for a while, and I can only remember one other flight from ATL to Gitmo. 95% of civilian flights are out of Jacksonville. Looking at its upcoming flights it looks like it is flying to Fort Bliss, TX when it leaves Gitmo.

https://flightaware.com/live/flight/DAL8820/history/20210612/1210Z/KATL/MUGM