A water maintenance crew works on leaky infrastructure in Skokie, a Chicago suburb. The area loses almost 22 billion gallons of water a year because of ailing infrastructure.
David Schaper /NPR
Federal Aviation Administration Administrator Michael Huerta answers questions Friday after touring the Chicago air traffic control center with Sen. Mark Kirk, R-Ill. (left), and city aviation Commissioner Rosemarie Andolino.
Charles Rex Arbogast/AP