A hearing has been pushed back a week to March 1 on Chicago's motion asking a Cook County Circuit Court judge to dismiss a suit challenging the city's authority to proceed with $3.36 billion worth of expansion projects at O'Hare International Airport without airline approval.

The delay comes as negotiations continue between the city and American Airlines and United Airlines in an attempt to resolve their differences over the timing of completion-phase projects that are part of an overall $8 billion expansion.

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