Just got ours plane tix a few weeks ago too. We're flying into Kansas City and driving over. Haven't heard anything about away tix. I think its rare UNT sells out their allotment. Even for the Arkansas game they didn't and that felt like it was a huge attendance away game.
We may fly to Miami for the FIU game just to experience South Florida for a weekend. We've also enjoyed the gameday atmosphere in Hattiesburg in the past, but its always rare that any Green is there. Getting there from Dallas is always difficult, and I think AA stopped flying into Hattiesburg/Laurel Airport. We may fly to Gulfport and drive over. Depends how cringe the team looks by then.
We'll probably drive to all the away driving distance games.