I doubt the first one since reporters and other non-cleared individuals routinely fly on Air Force One. Perhaps you are thinking of the National Emergency Airborne Command Post (NEACP) pronounced Knee-cap. A specially modified Boeing 747-200, equipped with communications and satellite uplink gear as well as the ability to launch ICBMs remotely.
If you recall on 9/11/2001, the President immediately flew from Florida to Barksdale AFB, LA, where the NEACP is based, among other locations.