Does the president have a Doomsday plane?
The E-4 serves as a survivable mobile command post for the National Command Authority, namely the President of the United States, the Secretary of Defense, and successors. The Boeing E-6 Mercury (formerly E-6 Hermes) is an airborne command post and communications relay based on the Boeing 707-320.
What is a Nightwatch plane?
The Boeing E-4 Advanced Airborne Command Post (AACP), the current “Nightwatch” aircraft, is a strategic command and control military aircraft operated by the United States Air Force (USAF). The E-4 series are specially modified from the Boeing 747-200B for the National Emergency Airborne Command Post (NEACP) program.
How many E-4B are there?

four E-4B aircraft
There are only four E-4B aircraft in the Air Force inventory, with one constantly on alert. The E-4B National Airborne Operations Center supports the National Command Authority (NCA) and the Chairman Joint Chiefs of Staff (CJCS).
What airplane always follows Air Force One?
E-B4 Advanced Airborne Command Post
The aircraft popularly called the “Doomsday” plane always follows Air Force One. This plane (there are reportedly four of them in existence), the E-B4 Advanced Airborne Command Post, is an airborne nuclear bunker and command center that was designed at the height of the Cold War to resist a nuclear attack.
What is the E 6 mercury used for?
The principle mission of the E-6 Mercury is to connect the national command authority with the U.S. Navy’s nuclear missile force carried aboard at-sea ballistic missile submarines.

What is the jet that follows Air Force One?
E-B4 Advanced Airborne Command
What is a NAOC?
Formally known as the National Airborne Operations Center (NAOC), this is an E-4B, the plane that America’s military leaders would use as an airborne command and control center in the case of a nuclear war or other very serious conflict.