In 1943 McConnell became chief of staff of the China-Burma-India Air Force Training Command at Karachi, India (later part of Pakistan), and remained in Asia for the rest of World War II. While senior air staff officer, Air Command Southeast Asia, and deputy commander of the Third Tactical Air Force in 1944, he participated in combat operations against the Japanese in Burma. In 1946 he was named senior air adviser to the Chinese government and, at the same time, commanded the Air Division, Nanking Headquarters Command.