Everyone is turning this into a dick measuring contest between ULCCs and Legacies...
The real answer to the question about will the pilot pool dry up is yes. Once growth slows at the ULCCs they’re going to need to do something to keep attracting/keeping talented pilots. Once the Spirit’s and Frontier’s reach their critical mass and upgrades start to stagnate then their contracts are going to have to offer pilots an incentive to come here over a legacy. Look at Southwest a few decades ago if you want to see how this will play out. If Spirit or Frontier start having their growth plans hindered by lack of pilots then it gives the pilots more leverage at the negotiating table and contracts will improve.
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