CHICAGO (CBS)-- The two largest carriers at O'Hare Airport are growing concerned with the cost of the airport's massive, multi-phase renovation plan.
City Council Aviation committee chairman Matt O'Shea told the Chicago Sun-Times that both American and United have been engaged in high-stakes negotiations on the renovation plans for "months" with a meeting between both airlines and the mayor's office held on Monday.
O'Shea also claimed that United has revived a 2018 threat to move its headquarters from Chicago if it doesn't get its way.
Those airlines say the enormous next phase of the expansion project, which will build a new terminal to replace Terminal 2 is already 24% over budget.
The renovations are funded by airline ticket taxes and landing fees, which is the main cause for American and United's concerns.
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