Air Force One is a military plane - can refuel in mid-air, so can stay up indefinitely, has all the communications equipment to keep the President functioning while in the air, all the protection, anti-missile systems, electronic countermeasures, shielded wiring, etc, etc.      The current planes are getting old and will need to be replaced.

Trump thinks the plane is a luxury, when in fact it's a necessity.     As much as I dislike Trump - as President, he shouldn't be flying in a regular plane - it's too risky.       He'll just have to live without the gold fixtures and red velvet and crystal.    He can still be a member of the mile high club in Air Force One - that's probably all he really cares about.