Southwest Airlines to Challenge Rivals at O’Hare and in Houston

Southwest will start service to Chicago’s O’Hare International Airport and Houston’s George Bush Intercontinental Airport next year, the airline said Monday. The moves mean expanding Southwest’s already large footprint in Chicago to take on

United Airlines Holdings Inc.


UAL -1.99%

and

American Airlines Group Inc.,


AAL -2.12%

and in Houston, to an airport where United dominates.

Southwest’s move is one of the first signs of the tectonic shifts under way

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