That C-20C Gulfstream is a pretty closely guarded aircraft, just reading up on them. there's 3 of them based at Andrews AFB, there is always one of them that flys to the closest AFB from where AF1 will be going and is always on runway alert.
Nothing has been published or released by USAF about them according to this book, apparently the theory is they are there to carry goverment officials in case of an attack of some sort. Interestingly all there instruments are analogue and there's no glass cockpit which makes it invulrenble to a EMP blast from a nuclear detonation...
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