A letter Hess wrote to his wife dated 4 November 1940 shows that in spite of not receiving a reply from Hamilton, he intended to proceed with his plan. He began training on the Messerschmitt Bf 110, a two-seater twin-engine aircraft, in October 1940 under instructor Wilhelm Stör, the chief test pilot at Messerschmitt. He continued to practise, including logging many cross-country flights, and found a specific aircraft that handled well—a Bf 110E-1/N—which was from then on held in reserve for his personal use.