Air Force E‑4B has nuclear-hardened airborne command center, EMP shielding
By Jim Hoft, The Gateway Pundit

A U.S. Air Force E‑4B “Doomsday Plane” (also called “Nightwatch” or the National Airborne Operations Center) landed at Joint Base Andrews near Washington, D.C., on Tuesday night, after flying from Barksdale AFB in Louisiana, i24News reported.
The E‑4B serves as a high-altitude, nuclear-hardened airborne command center for the U.S. President, Secretary of Defense, and Joint Chiefs.
Outfitted with EMP shielding, hardened communications, and room for dozens, it is designed to maintain continuity of government in worst-case scenarios—and stay aloft for days via in-flight refueling.