First off, not to state the obvious but if it was destined to be a slam dunk, Massport wouldn't have had to twist Jetblue's arm and kick in about $400,000 in freebies to get them to start service. That said, there's more to running a profitable airline than simply full planes with 'reasonable' fares. Typically that's a good recipe to losing money in the airline business. I would estimate a first year average load factor of 55%, maybe approaching 65% in the second year, after which service will probably cease. I'm sure there will be plenty of days where load factors are up around 100% but there's also going to be the weekdays in January and November when these flights are running at 30%, or less. Also, the demographic on nearly any Florida route, except Miami is straight leisure - budget conscious travelers who book flights many months in advance on ass cheap fares - the $79 each way type deals. Airlines don't make money on that, often times they don't break even. By Jetblue's own admission, they are not profitable in Boston. Why on earth would they be profitable in Worcester?