This is a very rough guide, but had a look at Aer Lingus timetable for summer 09. Simply by selecting destination from Belfast and seeing what flight days that route operates.
As mentioned before AMS has been reduced from daily to 4 per week, Lanzarote reduced but at least still bookable, now 2 per week.
Milan and Munch also back for summer 09, still 3 per week,
Paris remains daily, can we assume doing slightly better than AMS??
Rome reduced from 4 to 3 per week.
LHR at 3 per day.
Faro at 4 per week, departures on 26 and 28 june already £187 with taxes and charges one way!!
Malaga at 5 per week,
BCN at 4 per week.
So it seems some if not all the flights are on sale, maybe some more surprises to come, HOWEVER appears Nice is not coming back after 23 Sept 08.
All in all seems like a decent operation, good to see Milan and Munich still on sale so must not be a disaster (Budapest). With EI and no doubt EZY doing bucket and spade routes, wonder will Jet2 pull Malaga, as currently not on sale for summer 09...