Jet2 and NYC
While I agree with some of the above, comparing New York and DXB isn't comparing like with like - NYC is a far more popular destination in its own right. If my family and work colleagues are anything to go by there might well be the market for short breaks/shopping trips to NYC to sustain twice weekly as people get more adventurous and have 'done' the European short break destinations.
But hey, I'm not a professional alrline route planner and it isn't my money...