CHICAGO (WLS) -- There's a battle brewing over airline gates at O'Hare airport. It's between United and American airlines.

Donation Options Search Search Search United Airlines jets sit at gates at O’Hare Airport in 2014. Scott Olson/Getty Images file photo Share United Airlines has filed a motion to intervene in a ...

American Airlines is suing Chicago over gate access at O'Hare Airport. United Airlines is the biggest carrier flying out of O'Hare, and American is the second biggest. United shareholders like the ...