I thought I would see if they had a basic runway for Area 51. Since it doesnt have standard aircraft (base) codes, I thought I would have to find it. I tried Yucca Lake, then Rachel, and Rachel was it. AR51. Danged detailed layout as well. I was looking at Google earth of the real AFB and the base in Prepar3D was right on. Same hangers, etc. Pretty hard to believe. Except for the grass of course, heh heh.
Perhaps FSX Accelleration has this. I was not aware. It was a pleasant surprise though. This will be used alot for its long runway for testing.