Air traffic levels were slowly returning to normal in the skies over Chicago after a fire on Friday morning at a busy Air Route Traffic Control Center put a halt to all area arrivals and departures, leading to the cancellations of more than 3,500 flights.
FAA Administrator Michael Huerta has ordered a 30-day review of safety and security at ATC facilities after a contract worker allegedly set the blaze that knocked out the computers controllers use to route flights.
