10 Biggest Construction Projects in U.S.

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6. Chicago O’Hare Airport Modernization (Illinois) 

Estimated Cost: $8.8 billion

This airport is known to serve around 65 million passengers every year, so it is fitting for them to improve and modernize the structure. The cost is said to be shouldered by grants from the Federal Aviation Administration, and is known to be one of America’s biggest construction projects ever.

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