Go to any flight tracker. Type in JFK as the arrival airport. Look for jetBlue and see what in-bound flights are E190's. That will answer your question. If I'm not mistaken, the E190 flights are 1000 series flight numbers.
[Edited 2006-12-03 05:32:21]
"It's not the size of the dog in the fight, but the size of the fight in the dog"
Well, if what I have heard is to be believed, I believe the flights @ BNA are doing quite well. Anyone confirm or deny that? Either way, these are fun to watch come in and leave out at the airport, plus they are very photogenic.
Damn I really wish B6 flew from CLE or CAK to EWR. I would love to fly on an E190. Hopefully the E-Jets will become more common in all major fleets and I will have the chance to fly on one. The B6 E190s look great and from what I have heard, they provide a great flight experience.
Still crossing my fingers on a CO E170 order...maybe someday.