Chicago Airfield is a raceday event featured in Need for Speed: ProStreet. The event takes place at Chicago Airfield and is hosted by the Battle Machine organisation. The raceday is unlocked upon Ryan Cooper dominating the Battle Machine Challenge: Nevada event. The raceday allows all participants to drive any vehicle of their choosing but a Grip and Drag vehicle is required for entry. A backup car may also be chosen but will be restricted to a single class.