The Brief Chicago Mayor Brandon Johnson has chosen Michael McMurray to lead the city's Department of Aviation. Mayor Brandon Johnson announced the appointment of Michael McMurray to lead Chicago's Department of Aviation, which oversees the city’s two major airports. (City of Chicago)What we know:The Chicago Department of Aviation oversees all aspects of O’Hare International Airport and Midway International Airport. McMurray also previously held city positions, including deputy commissioner for the Department of Aviation. Tracey Payne has been serving as acting commissioner since last month after the retirement of former Commissioner Jamie Rhee.