American Airlines also said it supported the proposal to move forward “in a way that protects the competitiveness of O’Hare.” But the carrier said work would be needed to keep the project within budget.

To cut costs and appease the two airlines footing much of the bill, Johnson proposed changing the order of construction. Work on the global terminal replacing Terminal 2 would be moved up, but the building of satellite concourses that would add passenger gates — but increase competition for

It's being called a huge step with airlines including Chicago-based United and American agreeing to move forward with the project after months of delays.

The City of Chicago and major airlines have agreed on terms to begin a new addition at O’Hare International Airport. On Friday, the airlines and the city agreed on plans to build a new international terminal that will sit between existing terminals that belong to United Airlines and American Airlines.

The city of Chicago proposed changes to construction on a new Global Terminal to replace Terminal 2 at O'Hare this week, garnering agreements from the airport's two busiest carriers.

American Airlines and United Airlines on Friday announced support for extensive renovations at O’Hare International Airport, effectively allowing a major rebuilding project to proceed, weeks after Chicago Mayor Brandon Johnson made key revisions to the construction schedule.

The project is designed to overhaul everything from security checkpoints and baggage claim, while adding amenities and more accessibility.

The new plan calls for getting Terminal 1 and the new Global Terminal built first with any leftover money going toward constructing Terminal 2.