wallp - perhaps BA and Easyjet have added so much capacity to Gatwick-Jersey along with Blue Islands at City, Aurigny at Stansted and Easyjet at Southend that it's doubtful there is room for a 5th airline between London and Jersey...
Of course mustn't forget Flybe and Jet2 are competing on East Midlands-Jersey, further reducing the potential for Luton-Jersey...