[QUOTE=inOban;11399115]Very probably. AIUI Ryanair's routes from Prestwick are largely a means if rotating frames through their maintenance base there. ie the frame which operates the return flight to Marseille is likely to be a different one. So the flight revenue is less important, just avoids an empty leg.
Unlikely. The crew are going to be working extra hard to offload pax, change aircraft and reload catering and board new pax all in their timetabled 25 minute turnarounds at Prestwick.
I live in Monkton and have never once have seen an aircraft changeover there as you describe.