To help answer some of these questions from above:
-The F-20 existed as one flyable jet, but the DoDs pick of the F-16 ended any hopes of export for the F-20 and it has since been scrapped.
-NASA has several T-38s. A majority are based in Houston at Ellington Field, for astronaut training (they have the Vomit Comet there and WB-57s also).
-The US does fly F-5s as aggresors at Fallon NAS
for the Navy and sometimes Nellis AFB
for the Air Force weapons school.
-4 pilotless drones out of Tyndall AFB
in Panama City, FL
, and also a detachment at Holloman in NM
, along with the German AF
training wing there.
- Planes divert often, and sometimes to Civilian fields. Also many civilian fields have dual use Air Guard facilities. With Operation Noble Eagle still going strong you will see jets over major cities. This is no secret you can view such news on the Air Forces webpage.
What you saw probably was a T-38C, do you know what color the plane was?
Ciao, and Hook 'em Horns,
Lt-AWACS, Yankee Air Pirate