If you spot a specific type of aircraft looming in the sky, it might signal that humanity is on the brink of catastrophe. Known as the "Doomsday Plane ... isn't always a sign of disaster.

Following is the text of the video. This plane is an airborne version of the Pentagon. It's an E-4B nicknamed the Doomsday Plane. The military calls it "Nightwatch." It's designed to survive ...

to replace the service’s E-4B “Doomsday” plane, designed to withstand nuclear war. The aerospace and defense company is ...