if FR were to name the airport Belfast-Derry, which they probably would, then two a/c and flights to LGW, STN, LTN, LPL, PIK, EMA, BRS, NCL etc would be all viable
I would doubt if Prestwick would stand a chance via Derry-for-Belfast when the coach & ferry service from Glasgow to Belfast takes 6 hours 15 mins city-to-city for £38.50 return!
50 mins to get to Prestwick
2 hours at airport
30 mins block time
30 mins to clear airport
2 hours on coach to Belfast
5 hours 50 mins or so. Plus associated air-travel hassle.
Given also the chap that posted up-thread about being a good traveller who arrived hours prior to departure, one wonders what the benefit of air travel is these days!