For OW JFK-BOS total tax and fees were just shy of $3 (yes three) for my booking. I would agree with Xlr in that the confirmation skywards sends you has a PNR for JetBlue but I could not use it to 'Manage my booking' on Jetblue.com but they also provided an EK PNR which did work on emirates.com. I had to call JetBlue to request my seat and asked them to email me a JetBlue confirmation just in case.