Another factor is failing or threatened major airlines. NK at peak had almost 3800 pilots. JetBlue has 4K and F9 2K plus. The legacies are snapping these people up.
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That makes direct flow from the regionals to a legacy harder.
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Absorbing NK pilots might totally saturate the major hiring for a year. People bailing from JetBlue, Frontier, Breeze, Allegiant, etc., will only add to that - to the detriment of regional hiring.