From Charlie Ward/Telegram

In the US, the "doomsday plane" was activated.

The Boeing E-4B Nightwatch took off from McDill Air Force Base and headed north, landing at Wright-Patterson Air Force Base.

The Boeing E-4B Nightwatch is more of an aerial command post. Such planes are called" doomsday planes "or" doomsday planes". They are intended for the president, the Secretary of Defence and other members of the top US military leadership in the event of a nuclear war, if the ground control structures are destroyed or damaged.