Study: Chicago, FAA underestimated impact of O'Hare expansion

More than 45,000 people will be adversely affected by jet noise if the runway expansion project at O'Hare International Airport is completed, according to a new analysis released Thursday that said Chicago and the Federal Aviation Administration severely understated how many residents would be significantly disturbed.

The study also said that the number of nighttime flights will be almost double what the FAA estimated in assessing the environmental impact of the $10 billion O'Hare overhaul.

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