United and American mega-hub anchoring the U.S. Midwest
O'Hare is one of the world's busiest airports, located about 27 km northwest of the Chicago Loop and serving as a primary hub for both United Airlines and American Airlines. The airport handles nearly every major U.S. carrier plus a deep bench of transatlantic, transpacific and Latin American operators. Frontier and Spirit add low-cost competition on domestic leisure routes.
Major carriers: United, American, Delta, Lufthansa, British Airways. Low-cost carriers: Frontier, Spirit, JetBlue.
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