The main problem I can see is the choice of aircraft. With Jet2 operating Boeing 737/757 it is not the ideal aircraft to fly into GIB. I know Enter Air operated a charter into the airport a few months ago, but BA, easy and Monarch have used the A319/20 for a number between of years. A few years ago I was diverted to Malaga as an easy 320 had gone tech, with a Boeing 737 used to take the passengers to Gatwick. It is a captain's only landing at GIB with easy being a captain's departure as well. Unless Jet2 use a Titan Airbus I would very much doubt seeing them in RAF North Gibraltar.