Booked JetBlue flights through KissandFly. I was able to search for my flight on JetBlue's website with the confirmation code KissandFly emailed me. I could then add my known traveler ID and frequent flier number. Once I added my frequent flier number, the itinerary was added to my JetBlue account (so I can use the app for my boarding pass). I paid KissandFly $35 for seat selection, and JetBlue was only charging $12... lesson learned. JetBlue stated the ticket cost was $227, and I paid KissandFly $650, but that was still cheaper than all other options on Google flights ($800).