Chicago O’Hare International Airport (ORD) is rare in that it is a hub for two of the largest airlines in the US: United Airlines andAmerican Airlines. Only a handful of other airports in the US play host to the two carriers, with Los Angeles International Airport (LAX) being a prime example. This has led to stiff competition at the airport, with the two airlines battling it out to win passengers on some of the country’s most prestigious and profitable routes.