Well. I guess that the first thing international travellers wanting to travel to Waterford by air will do is to do a google search if there is an airport at all and what services are available (and they will be the far smaller group of customers of the airline as the service is clearly targeted at the outbound crowd, not the inbound crowd). It seems very unlikely these punters from abroad will go straight to "www.aersoutheast.com", see "Luton" and come to the conclusion that there is no London service.