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Trump seems to think that turning an existing production 747-800 into an AF1 plane is simply a matter of changing the seating layout and the paint scheme.
The AF1 747s are built with vastly different communications and avionics so they can serve as secure flying command posts during emergencies. They can be refueled in mid-air (a tanker plane follows it around when the president is on board, just in case).
They're also used in pairs, with the other plane on standby at a nearby airport.
@mattblaze Is the “standby pair” NEACP or is that a different aircraft?
@krans The NEACP planes are a different fleet. AF1 flies with its twin VC25 positioned at a nearby airport, in the event either something goes wrong with the plane or they can't get the president to the original airport. And there's also a tanker circling, ready to chase the AF1 plane after it takes off.