MAN does have a summer timetable online: http://www.manchesterairport.co.uk/manweb.nsf/Content/TimetablesArchive

But it’s as much use a chocolate fireguard as when I looked at it, it still had the new easyJet services starting in August and not in May as they recently announced.

Having said that, going to http://www.manchesterairport.co.uk/MANFlightInfo/SearchFlights provides a listing as well, plus it gives an idea of the charter services by listing tour operator and day/time of departure.