It's Airport Appreciation Day Sunday at the St. Clair County International Airport. The event will see lots of fun and family activities, according to director Kathy Reaume. Displays shown will include motorcycles, antique autos and tractors, monster trucks and more. The event goes on from 9am to 2pm Sunday. The event is sponsored by the airport, as well as the Experimental Aircraft Association Chapter 9-79 and the Friends of the Airport. The airport is along North Airport Drive off Gratiot in Kimball Township.