Or so the speculation goes.
A military transport plane [actually a commercial-style airliner owned by the military] is booked into the airport next to Trump's Turnberry golf course on the 19th. It's one Trump has used before. If so, it will be a drop-off as Trump loses all authority on the 20th.
I suspect Trump is going to assume his British citizenship to protect himself from US justice. He has it from his mother by right of blood. From there, he'll fight his extradition, abusing British law, probably using the same sorts of ruses as Assange. Depression. Mental incompetence. Scepticism of US courts and jails. etc.
All that money raised from the rubes is a slush fund for his retirement at his golf resorts around the world.