If the aircraft was to depart on a holiday flight at 0930 then the morning flight would have to run (Based on 45 min turnarounds, 1:25 flight time to EDI)
I agree that the timings have got to be better for a morning domestic and so for it to fit in with a charter flight after getting back to BOH, but 45 minute turnarounds on a 735 domestic flight is really unreal. 25 minutes would be the most needed and the departure times to it's holiday destinations could be slighty modified...