Jet 738
I'm not disputing J2 business model or its strategy of running used aircraft. Jet2 Holidays have done very well. The transatlantic stuff is rather different, a few seasonal Xmas flights does not make for a successful transatlantic operation and certainly not with very old 757's on ad hoc ops.
Loyalty is this game is very shallow as a quick look on Skytrax will show!! next Summer will show whether they have built enough resilience to the flying programme to support an ambitious summer with different aircraft.
Good luck and good to see them doing so well