682 there are two options that are a possibility for Jet2 to do Teneriffe and Cyprus neither of which need -400s. Firstly a runway extension at LBA with I believe a 300m starter strip at the 32 approach end being mooted. Secondly I believe an engine mod on the CFM56s would allow the extra range due lower fuel burn. Both are expensive one to the airport the other to the airline. Given LBA never seems to do anything until there is no other choice I guess the runway extension option is out. Given Jet2 management are shrude dudes I suspect modification of one or two of their ac might be a possibility if they want to tap these routes.