Does Jetblue charge for headphones (earphones)?
For a period of time, JetBlue gave away headphones for free. Now they sell them for $1 at the gates using an honor system – just put your dollar in a bin and grab a headphone from a plexiglass box.
JetBlue also sells headphones on board, but only accepts credit card at that point. Our latest information indicates the cheaper headphones are $1 on board, and you can get a better set for $5.
Since the headjacks provided by JetBlue utilize standard jacks, you might consider just bringing your own headphone to be used on board. Any headphone that works on a standard MP3 player should work just fine.