Ryanair's arrival at EDI will mean an increasingly crowded marketplace. There is not an infinite supply of peope who will use the airport and when they do the ones who browse for a bargain will choose Ryanair, and while Jet2 and GSM may not be relying on these customers essientially, it all adds up. There have been arguements about Dusseldorf, ie that Jet2 and FR will not really be competing as the airports are well apart, well I would argue that this market would be limited and the customer will choose between FR ( as per website Destination Dusseldorf (WZE)or Jet2 (as per website Desination Dusseldorf (DUS) based on price and not as much on choice of airport. FR will offer a far lower price and also its operating fees at its choice airport would be alot less than DUS??
As for the comments that GSM and Jet2 are well known in the EDI area, Ryanair have been operating at EDI albeit on a limited amount of routes but they have significant traffic on the Dublin route so alot of people are already familiar with the brand.
Besides all of that FR will not allow Jet2 to come in and teach them a lesson.
EI-BUD