Hola!
I was just about to post a topic about the same aircraft, but Anthony beat me to it.
I was at the airport at that exact time, spotting at the top of the domestic terminal parking structure. Suddenly, I saw this big dark aircraft you're talking about, turning final for 05R.
I had my scanner with me. It was a US
AF C-17, registration 21101, based at Charleston. Callsign was Ridge 1817.
It landed on 05R at exactly 1310 local, so there's no doubt we're talking about the same plane.
21101 parked at the FAM ramp 8 minutes after its landing.
Does anyone have any idea about the purpose of this flight? They didn't have an assigned stand for the C-17, it had to wait for about 3 minutes on E taxiway, waiting for ground to assign a parking position, which ended up being at the FAM ramp. Maybe it wasn't an expected visit?
Saludos,
Bernardo
"... for there you have been and there you will long to return."