The IMCO CallAir A-9 is an agricultural aircraft that first flew in 1962, a development of the company's previous successful crop-dusters.

[1] Like the earlier CallAir aircraft, the A-9 is a single-engined monoplane with a braced low wing.

It is of mixed construction, with a fabric-covered steel-tube fuselage structure and a wood-and-fabric wing.

The pilot sits behind the chemical hopper, and the cockpit is enclosed by two removable, bottom-hinged doors that form the left and right side windows.

IMCO was in turn purchased by Rockwell International in 1966, which built the plane under its Aero Commander division before shifting production to Mexico in 1971, under a joint venture there called AAMSA.