I agree Turkish is the most likely here, but until this is confirmed (if it ever is) there is still room for speculation on what else it could be.
I wouldn't say it would be too far into the realms of fantasy of a New York connection, we did have this around 2016 with United B757s though of-course this didn't work out. Perhaps though with a lower cost base of JetBlue, more fuel efficient and slightly smaller planes and a less frequent schedule (United operated 5/6 times a week which no wonder was overkill) there maybe rationale to suggest how it would work better.