NASA 931
I believe I saw it overhead on approach to Ellington for it's last landing. I was lucky enough to do 40 unforgettable parabolas in that airframe. And I didn't even puke! ;0~@#$%&
They're replacing it with a more easily maintained jet. A (D)C-9. Similar length, less power, lower ceiling and alot less (unecessary) fuel capacity.