The plane Carrie flies back to the US on is registered in Morocco (CN). If this was really an official (FBI) jet flying from Afghanistan to the US, this would evidently not be the case and reveals the series is actually filmed in Morocco.
This last season stay off ok, but honestly the last few episodes are really starting to drag.
It's like they ran out of story 1/2 way through, and decided to make about 4 episodes of carry just playing a game of find and seek.