United as well
As far as purchasable airlines, Delta Airlines, American Airlines, United Airlines, Alaska Airlines and Allegiant Airlines. The specific regional airlines that contract those major airlines are Horizon Airlines, Compass Airlines, and Skywest Airlines. United and Allegiant are the only ones that have mainline service.
NetJets and Sun Country as well.
Delta, Skywest, allegiant, horizon, Alaska..... that's all I can remember
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