as much as people like to make fun of Spirit, it is absolutely ridiculously affordable and probably the closest the US has to a true low-coster. I love having that option. JetBlue on the other hand is a typical US cheap-service, no-food, not-cheap tickets posing as a "lowcoster" which it really isn't. It already ate and digested Virgin America, would hate for it to keep destroying more affordable, and quite frankly, much better options.