Very easy question...I have no control. I can't stop the plane and get off if I want. I don't fear dying that's not it, nor terrorism either. It's really more the "I need to get out of here and I can't" dilemma.
It really sounds like you want to be comforted about flying in general, and not specifically about Jetblue. Flying on all airlines is almost the exact same experience with certain details that may not matter for a "fear of" flyer. On a recent business trip I was booked on 3 different airlines (United, AA and Delta) over 4 days and still have to look up which one I took when since they are all a blur of the exact same experience.
If it makes you feel any better, flying is way, way more safer than any other method of going that distance. You also don't have to worry about paying attention (once you're on board), about your car breaking down, looking for a place to eat or pee, etc.
As far as Jetblue, as others have mentioned, they have one very cool feature....those TVs. I don't fly them much, but when I do it really makes the trip so much better, even if you get stuck sitting near or next to someone you don't like. Jetblue's only weakness is their hub structure, which can contribute to possible delays later in the day, more so than perhaps other airlines. Every single flight, with a few exceptions like yours, either takes off or lands in NYC, as they hub in JFK, and also do LGA for some routes. This is the most crowded, and thus most delayed airspace in the US. Taking one of their directs from A to B that doesn't involve NYC reduces your possible ATC delay factor, but doesn't eliminate it since those direct route planes still have to come from NYC at some point first before picking you up.
But beyond that, Jetblue is nice. I'd say your bigger issue is researching TSA and the BS you may go through there. Know what to bring, and what not to, and know how to pack and unpack your stuff (electronics, etc), undress

at the scanner, etc. Keep an eye on your stuff, limit the number of bins you have to use, etc. Rehearse it in your head as you walk up. And remember, you can opt out of the body scanner if they force that on you. I never do the X-ray version (the blue and black one) but will reluctantly accept the back-scatter version (with the rotating glass tube and L3 logo) if the line is long.
I hope you have nice flight.