 The outer ring of Milwaukee's Class C Airspace begins approx.17 miles south-southeast of the field, with Waukesha County Airport and Lawrence J. Timmerman Airport's Class D Airspace beginning 18 miles south-southwest and 14 miles south (respectively) of the field.The nearest special use airspace is Restricted Airspace R-6903, which is superimposed over the Minnow MOA (Military Operations Area), approx.