CHICAGO — American Airlines and United Airlines on Tuesday sued Chicago to block its financing of remaining projects under an $8 billion expansion program at O’Hare International Airport ahead of the city’s planned sale of $1.1 billion of passenger facility charge-backed bonds next month.

The two main airlines at O’Hare filed the suit in Cook County Circuit Court. It asks the court to block the city’s funding of projects included in the completion phase of the expansion plan and to bar issuing any general airport revenue bonds until the court decides whether the carriers’ approval is needed.

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