Most airlines use something called a hub and spoke model. You fly from small town to big city. Then big city to big city. Then big city to small city. It’s like how you can go from the small spoke of a wheel to the hub of the wheel in the middle, to the spoke on another part of the wheel.
Airlines make partnerships to enable this. Delta is an American airline. But they have deals with Air France, KLM, Korean Air, China Airlines, etc. So the first flight you take might be run by Delta, but the connecting flight is run by a partner airline.
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