November 16, 1920 – Cheyenne, Wyoming
Cox was flying de Havilland airmail airplane #182 on December 15, 1920 when, while landing, "a puff of wind from the quarter skidded me into a small pole on top of the wireless tower, hooking the left wing near the end. I immediately jammed on full right rudder but to no avail as the drag was too much for me to overcome and the ship hit the ground, left wing first and slewed around coming to a complete stop." Fortunately, Cox was uninjured in this crash.
Cox's positive attitude was well regarded among his peers and bosses. On January 27, 1921, Arthur Cox left Rock Springs, Wyoming at 1:40 pm. When he reached the highest point of the Wasatch mountain range, he encountered heavy snow storms and low hanging clouds which he struggled in for one hour, searching up and down the eastern edge of the storm for a hole. He flew through this at an altitude of 8,500', barely clearing some of the peaks. According to his boss, Cox flew that trip on a freezing cold day, without a flying suit but, "nevertheless [arrived here] wearing a cheerful disposition."