Koerner tests the P-40.

Proud possession, membership certificate for the Warhawk Pilots Association.

Koerner with his first aircraft, a Standard, circa 1924.

Koerner’s mid-wing racer at the 1st National Air Race, Glenview, Illinois. It was based on the Heath Parasol.

British-built Heath Parasol G-AFZE. It is still extant, currently under restoration at Reigate, Surrey.