Depends on where the threat is coming from, obviously.

There's the Pentagon, Raven Rock Mountain Complex, Mount Weather Emergency Operations Center, Cheyenne Mountain Complex, the Greenbrier bunker, the Peters Mountain facility, 33 Thomas Street, nearly a dozen aircraft carriers, Camp David, and god knows how many military bases.

Or he could just board the doomsday fleet of E-4Bs and stay in the air ("Airborne Command Center")

I mean, the Pentagon doesn’t sound like being on airforce one ?

You’re not suggesting AF1 can actually land on a carrier are you?

Marine One. Which is likely how the President would get from the White House to AF1 in the first place, if that were the getaway plan.

Yea marine one could, fair enough.

Nebraska

Red Lobster

COOP / PPD-40

Government Continuity of Operations:

Continuity of Operations (COOP) is a United States federal government initiative, required by U.S. Presidential Policy Directive 40 (PPD-40), to ensure that agencies are able to continue performance of essential functions under a broad range of circumstances. PPD-40 specifies certain requirements for continuity plan development, including the requirement that all federal executive branch departments and agencies develop an integrated, overlapping continuity capability, that supports the eight National Essential Functions (NEFs) described in the document.

<https://en.wikipedia.org/wiki/United_States_federal_governme...>

See also:

Post Attack Command and Control System: <https://en.wikipedia.org/wiki/Post_Attack_Command_and_Contro...>

United States Continuity of Operations Facilities: <https://en.wikipedia.org/wiki/United_States_Continuity_of_Op...>

<https://fas.org/irp/offdocs/pdd/pdd-67.htm>

Depending on the circumstances he may stay in the air until the threat was resolved. Assuming the US tanker fleet isn't wiped out Air Force One and its escorts can stay aloft indefinitely and act as a command center for the military. That's the plan in case of nuclear war.

> Where would he go?

Nowhere. AF1 can be refueled in the air indefinitely, and carries enough food and water for several days. You ground civilian traffic and shoot down anything non-military in the air; nothing's getting to you.