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What if after her retirement from Trans-Atlantic use, the SS United States was converted to a Presidential Yacht?
It could be used by the POTUS and his staff as a more leisurely way of transit if there's no time sensitivity.
I'm supposing it would need to have the following capacity for
2 x Marine SeaKing helicopters
A Marine Company detachment
A full Presidential motorcade (loaded & unloaded via a side ramp when in port)
A full Secret Service complement
A full Comm's suite such as carried later on in the USAF's E-4 NAACP
A full crew so it could be used in the same way as the Royal Yacht Britannia in trade and diplomatic talks when in foreign ports.