[blessedwhiskers]

JetBlue also has pretty limited landing slots on the west coast, and missed out on purchasing Virgin Atlantic to Alaska a few years ago, which would have allowed them to diversify more outside the eastern US.

Spirit isn't a perfect match (different market segments), but otherwise they use the same model of aircraft and have some operational efficiencies. I'd hazard a guess Spirit's branding and low cost model will be tossed out in favor of JetBlue's operating model, and that segment of the market will be left to Frontier.