Construction began recently on the south satellite control tower building at Chicago O’Hare International Airport. The facility is to monitor traffic that will primarily use the airport’s new Runway 28L/10R, which is to open in the fall of 2015. The top of the tower-cab antennas will rise 219 feet agl, with the controller’s-eye-view inside the cab set at 194 feet agl. The $28 million facility is expected to operate from 6 a.m. to 10 p.m. local time.