The Boeing E-4B Nightwatch, nicknamed the 'Doomsday Plane' and 'Flying Pentagon,' was recently spotted at Los Angeles International Airport, marking its first public appearance in 51 years. This highly specialized aircraft serves as a mobile command post for US leaders during national emergencies, designed to withstand nuclear attacks and ensure government continuity. Its rare sighting, coinciding with global tensions, fueled speculation, though the Department of Defense later stated Secretary of Defense Pete Hegseth was aboard as part of a tour promoting the defense industrial base.