Has Its Own “Doomsday Plane”
When it comes to the protection of the sitting POTUS, nothing is left to chance. For this very reason, Air Force One has its own protection of a sort, in the form of a “Doomsday Plane”, call signl E-4B. Basically, this plan has Air Force Ones back. The plane is designed to stay in the air for days and is able to outrun the explosion of a nuclear weapon. The only function of this aircraft is the protection of Air Force One, and the POTUS, should its unique form of service is required. The 747 follows the POTUS aircraft everywhere it goes, with the sole purpose of a specialized type of security.
Image Credit: Juke Schweizer, CC BY-SA 4.0, via Wikimedia Commons