I own CityLinQ and I operate my routes with B737-200 Adv. The timetabler states that the plane can have a minimum turnaround time of 35 minutes. Much to tight... so I putt it to 60 minutes. There you come to the point that the timetabler tells you the delay probability is less then 1%.
So I do have a plane returning from a sub tropical bounty island... it has a turnaround of 75 minutes and still.... 33,33% of the next leg is cancelled due to to tight turnaround times.... Thats a bit odd don't you think....