American Airlines is now suing the City of Chicago, arguing a plan to hand over roughly six O'Hare gates to archrival United is part of a plan to "marginalize" American and is a violation of its lease agreement.

Trade at Chicago’s O’Hare International Airport and New York’s JFK International Airport each increased more than 100% from the previous March, according to U.S.

Wednesday marked the first day that those looking to board domestic flights needed to present a Real ID​, passport, or military ID — or go through longer screening times.

United and American Airlines are clashing in court over gate assignments at O’Hare. Here's how a 2018 lease deal set the stage for the dispute.

The Illinois Department of Public Health (IDPH) is sounding the alarm on a potential measles exposure at Chicago O’Hare International Airport. Here's what you need to know.

American may be fighting an uphill battle at O'Hare. United is based out of Chicago and considers itself to be the official airline of the city. United also holds naming rights to the home of the Bulls and Blackhawks, the United Center on the city's South side.

A Chicago police report indicates the security scare happened during a shift change for TSA officers at the security checkpoint where the man entered the terminal.

Despite the May 7 deadline, passengers without the enhanced IDs — or other acceptable identification, such as a passport — were still allowed to board their flights with additional random security checks.