there are many AC you can still use. The Lakenheath F-15's that are here, both C or E. Then you have the GMAX F-15's from Coral with many reskins to use at different bases.
Krzysztof's C-5
Rick Sasala's fine GMAX aircraft
Prowler
S-3B
P-3 Orion
A-6E Intruder
there is also a GMAX F-14.
I've used Lago's F-16's with no problem either.
Also Dean Reimers F-18's.
No A-10s or Tankers. Posky's C-17 works but there are no wheels or flap movement but that shouldn't be a big deal if your only looking for AI AC

Is there a updated AFCAD yet to make parking at all these military bases. I had a huge list for 2002 which won't work in 2004 :-[