Members of Call family in Wyoming designed simple utility aircraft for neighbouring farmers and ranchers, 80-hp Model A flown 1940. During war Call Aircraft Co. registered at Afton, but production impossible until 1946. Model A-2 had 100 hp, A-3 125 hp, A-4 135 hp then 150 hp, A-6 180 hp, A-9 235 hp and B-1 400 hp. From this came even greater variety of CallAir aircraft, but in 1962 Call bought by IMCO.