JFK flights have been on and off since the 70's. BOAC tried via MAN and PIK. BA had a dedicated 767 in the 90's rthen educed the service to a 757 via YYZ. Non of them were consistent. So far United seem to be the only carrier committed and that's being reduced during the winter. To be honest travelling around the region I've never seen any ads or promotions for the JFK route unlike Jet2 who in my view have an excellent marketing campaign both on TV and advertising in Birmingham.