The sun sets behind the FAA Control Tower at Chicago's Midway International Airport on Tuesday, March 17, 2020, in Chicago. The FAA closed the air traffic control tower at Midway International Airport, at 5 p.m Tuesday, after some workers there tested positive for the new coronavirus. Air traffic control operations for Midway will be temporarily moved to another FAA facility as the towers is being cleaned and disinfected. (AP Photo/Charles Rex Arbogast), APTOPIX