If he did need to stay airborne for an extended period of time an SST is not the right choice. Ever notice that concord only flew to like 5 places?
Air Force One is like a really fancy bus in the sky to transport POTUS to conferences.
The agreements created in these conferences are not honored though, and therefore they are a waste of time.
We have also invented reliable and secure transcontinental telephone lines, email, and teleconferencing since then. It's the reason why you don't see large permanent foreign delegations and diplomatic corps camped out all over in DC year round. Most folks know Watergate from the Nixon scandal, but it was actually like a disco-disco, hookers-and-blow version of EPCOT center before email was invented.
We don't need the current Air Force One, let alone a new one.
It
IS VERY INTERESTING, however, to consider what the National Airborne Operations Centers (NAOC), or "Doomsday Plane" should be replaced with, from a tech perspective. That is the one that needs extended loiter time. Currently, the plan is to fly it all around in the sky and say "
Please don't shoot me down!" There are other measures taken for protection, obviously.
It would be more interesting to have a
SMALL capsule-type replacement for the NAOC that could be placed in geosynchronous orbit in the middle of the United States and defended. That would be very cool.