The article, while it may be onto something regarding Trump wanting US agencies to stay at his hotels, is creating a false/misleading narrative - US military aircraft land and stopover at Prestwick every day, and it's not unusual for aircraft going to Kuwait to stopover at Prestwick. The variable is weather, airspace/storage/accomodation congestion at different air bases/airports, and headwinds. Those decisions are often made while the aircraft is over the Atlantic, and the hotel booking might only be done when the aircraft lands.
Check the spotter websites, it's an unusual day when there aren't US aircraft at Prestwick.
Also often visited at least for refuelling by CIA aircraft although you won't see them on the spotter sites.