On city to eventual destination, Ryanair win everytime. Air France and SN Brussels gave up at Glasgow when Ryanair prevented their Brussels and Paris services carrying enough Y punters to make a profit. FR flew from Prestwick to Beauvais and Charleroi respectively. The passenger choice was made purely on price and Glasgow no longer has enough high yield traffic for the route to work like EDI, relying on a lot of transfer traffic at CDG.
Hence if Ryanair get me to Dusseldorf for less then Jet 2 and Jet 2 are not in the same league as BA to make it worth paying more.......then people book Ryanair. For price they are unbeatable and Jet2 do not have a high class product to make it worth paying more. To say that Scotland will be loyal to TD and flyglobespan is naive. A few will be, however MOST don't allow sentiment to creep in. We shall see....