I don't think charging for DirecTV on jetBlue is a great idea. Yes, when they first started, they were going to charge for the service, but today I dont think they can. They have a reputation now for offering free TV, its just one thing that set them apart. Frontier can get away with charging their customers becuase they never set a standard of offering free live tv service and it became a norm for them. Even if jetBlue does charge for the TV service at a reasonable $5... than you tack on the $5 for the fox movie on domestic flights, that brings entertainment to $10, which at that point the one of most expensive inflight entertainment option in the industry. Basically what I'm getting at, if jetBlue does it, I think it will create a customer service backlash. But thats just what I think, not saying I'm right, but thats what I think.
PS: As for ideas for jetBlue, I suggested that they have some sort of service that allow customers check flight info on their cell phones (such as how people check bus status on nextbus.com). Most phones are web enable to view sites design for cellphones... they got back to me saying it was a good idea and their going to look into it... basically... if they like your idea, they will tell you.