Chicago Airfield II 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 Willow Springs 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.