There is a huge Dee Howard airfcraft maintenance hanger at SAT
and I always see a lot of aircrafts that are not scheduled passenger flights here. I have unfortunately never seen JT
's 707, I guess I have never been around that area around those times.
I usually see Saudi Arabian aircraft (MD11), Malaysian Airlines (either 777 or MD11) on a couple of occasions, a couple of Tower Air's 747 and then several unmarked 747's with an all white fuselage and tail.