Intermountain Manufacturing Company acquired at public auction the former Callair Inc., developing from the well-known Callair series of agricultural aircraft an improved model designated IMCO Callair A-9. A scaledup version, the B-1, first flew on January 15,1966. IMCO sold the Callair assets to Rockwell-Standard Corporation in December 1966 which continued production of these aircraft at Afton, Wyoming, under the banner of Aero Commander.

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