I believe that's default FS9 scenery and the AFCAD and traffic from the West Coast ANG Military AI package available on simviation and flightsim.com. The "AI" Eagles are David Bushell's non-AI model, so they're kind of hoggish on frame rates, but the flightplans ensure no more than about 6 are on the ramp at any given time, so it's still flyable on most machines.
And yes, KLMT is a beautiful area for a flight!
Dan