American Airlines punches back in Chicago, in ‘fourth inning’ of O’Hare rebuild

Chicago has long been competitive turf for airlines, but with some pretty well-defined roles. United Airlines is the clear leader at O’Hare International Airport (ORD), its home base. American Airlines is a distant second, with its own O’Hare hub operation. And some 30 miles down the road, Southwest Airlines operates a major base at smaller …