Ive been going through the timetable and can only find work for four aircraft as Going loco said
Only obvious gaps I can find are on Monday-Thursday afternoons, and on Sundays where one aircraft only appears to do Cork. Though with retimings, additional flights could be added to the schedule at other times
The Kos is a bit of a mystery, but maybe its an error on the Goldtrail website, or maybe the plans have changed. Could a B737 make it to Kos since one will be free on a Wednesday from 1405 after getting back from Palma?