If you have the Jet Blue charge card you get free checked bag so those people check the first option. If you don't and then decide to check a bag do so at the time you get boarding pass because it'll cost more if you wait until you get to airport. Or take a chance, pack carry-on and our flights from BOS to SXM are always full and they then offer free checked bag.

They also offer something (forgot what it's called) that is supposed to get you through TSA faster, Don't bother because it isn't always faster. TSA agent told us JB pays for a dedicated agent but only one and at times regular lines move faster. AS to more leg room, we find the seats have enough room to not warrant the extra cost , $95 I think.

Back in the day, when we first discovered JB it was worthwhile for us to drive to Boston for the direct flight and bags were free. Now JB is similar to other airlines except, in our case fewer delays. We gave up on USAir from Providence after missing too many connections either in Philly or Charlotte and shortening our vacations.