Had a search through the Knock winter timetable there, snug doesn't begin to describe it. Plenty of flights alright but there won't be many airports to be found with as limited opening hours as Knock will have.
Six of the seven days the airport will have its first arrival scheduled for no earlier than 10:40 and on all seven days there are no departures scheduled for later than 16:15. If you were to assume that an airport needs to be open two hours before the first departure and can shut half an hour after the last arrival, the opening hours of Knock this winter would be as follows:
Monday - 7hrs 15mins (12 movements)
Tuesday - 7hrs 45mins (10 movements)
Wednesday - 7hrs 35mins (16 movements)
Thursday - 7hrs 45mins (10 movements)
Friday - 7hrs 30mins (16 movements)
Saturday - 9hrs 5mins (9 movements)
Sunday - 7hrs 15mins (17 movements)
There is one early(ish) flight on a Saturday arriving from and departing to Liverpool but I wouldn't be surprised if the timings were changed for that one too. Saturday is the quietest day but has the longest operating hours. Are the airport management's backs really this far pressed up against the wall in financial terms or are they just being tight?