Of all the things that caused major airlines to fail post 9/11, I think rapid growth beyond control is often overlooked. United and American were just way too large (They carried over 50% of the U.S air traffic). As a result, they laid of a bunch of workers, slashed their fleets, cut some routes, and restructured. JetBlue is growing faster than any other airline, and as a result their costs are growing. Maybe a slowdown in growth would be healthy for both JetBlue and the airline industry as a whole (given the overcapacity keeping fares down).
Not advocating cutting the fleet, layoffs, or even putting a stop to hiring. Just a slowdown in growth may be the best medicine for JetBlue right now.