I have used this UK website to plan holiday travel in Europe for a couple of years. Its special feature is an interactive map which shows every flight route between airports in the UK and any other airport in Europe. This is not always 100% correct as a map, as sometimes on minor routes a service has ceased or is yet to start, but you find this quickly in the supporting text. This map makes it much easier to use than the booking sites such as Expedia etc when doing the planning of travel. This website does offer some fairly rudimentary links for booking but having sorted the options I will then go to the airline site or a booking site.
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