Chicago Aviation Commissioner Ginger Evans, who helped craft a groundbreaking runway rotation plan to distribute jet noise around the region, resigned Tuesday.
Evans' last day will be Aug. 1 after three years on the job.
"In a herculean feat accomplished in a small amount of time, Ginger has negotiated a historic $8.7 billion agreement to modernize O'Hare; opened two new runways and the first new gates in 25 years," Mayor Rahm Emanuel said.
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