A flight out of Chicago was forced to return to O'Hare Airport after several bathrooms clogged mid-flight, and an investigation later found why.

Residents and businesses in the Chicago area are being asked to take ... say millions of birds are expected to fly over the state of Illinois on both Tuesday and Wednesday nights.

According to the Chicago Office of Emergency Management and Communications, military helicopters are expected to fly over the city ahead of and during the DNC. "Military helicopters will be flying ...