From the London Mail [caution, tabloid]:
President Donald Trump‘s emergency command aircraft was caught making a mysterious flight from Louisiana to Maryland on Tuesday. The Boeing E-4B ‘Nightwatch’, also known as the ‘Doomsday plane,’ serves as a flying command post for key officials during times of crisis, particularly designed to survive a nuclear attack and coordinate military actions. The craft took off from Bossier City at 5:56pm ET, traveled along the coast, looped around the border of Virginia and North Carolina, before landing at Joint Base Andrews at 10:01pm. The mission lasted over four hours, sparking online speculation, especially after users noticed a never-before-seen callsign, ORDER01, instead of the usual ORDER6.