doomsday plane
Definition
A heavily fortified airborne command post, typically referring to the U.S. Air Force's Boeing E-4B 'Nightwatch' aircraft, designed to ensure continuity of government operations during a nuclear war or other catastrophic events.
Informally, any aircraft modified to serve as a mobile headquarters capable of surviving electromagnetic pulses and coordinating military responses in apocalyptic scenarios.
Examples
The doomsday plane taxied down the runway, its passengers sipping coffee while plotting humanity's backup plan.
Spotters geeked out over the doomsday plane's latest upgrades, whispering that it could probably survive a zombie apocalypse too.
In a world of escalating tensions, the doomsday plane remains parked and pristine, like a cosmic insurance policy nobody wants to cash.
Politicians toured the doomsday plane, marveling at the mid-air luxury that makes Armageddon feel almost vacation-like.