From OPs link
Quote:
The Scottish government bought it for £1 in 2013, when it was facing closure.
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Quote:
Air Force One seen at Prestwick Airport during the president's 2018 visit
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They were there on official business. They're not going to search around everywhere for the nearest petrol station when they have one to hand.
Standard business practice is to offer deals for a big event.
Unless Trump personally insisted they stay there and there are plenty of other suitable hotels in the area, there really is nothing to see here, as per usual.
Anyone would think Trump was sending people there for random reasons.