Economy. Really, would I REALLY be willing to pay $2500 to fly United or US Scareways first (or god forbid, Northwest DC9 first class) cross country rather than pay $750 to fly with jetBlue cross country? Really. I'll take the $1750 savings and get myself a nice hotel room, go to a nice dinner, and get a full body massage after the flight. And I'd still come out ahead.

Just for the record, the "even more legroom" section on jetBlue's A320s have 38" pitch.