Which of the following airlines does Republic Airways operate flights for?

Republic Airways operates flights as a regional carrier for American Airlines, using the branding of American Eagle. This partnership is part of a broader agreement that enables American Airlines to extend its route network through regional flights. Republic Airways provides vital feeder service for American Airlines, allowing it to offer more destinations and improve connectivity for passengers.

The association with American Airlines is part of a larger trend in the airline industry where major airlines collaborate with regional carriers to enhance their service offerings without the cost of directly operating all routes themselves. This allows Republic Airways to benefit from the brand recognition of American Airlines while offering essential regional service.

In contrast, the other airlines listed do not have a partnership with Republic Airways. Southwest operates as a low-cost carrier and does not utilize regional partners in the same way, while Alaska Airlines and JetBlue Airways also maintain their own networks and do not utilize Republic Airways for regional services. Therefore, American Airlines is the only correct choice among the options given, as it is directly linked to the operations of Republic Airways.