 He was also instrumental in establishing the first aerial mail passenger service between Beijing and Tianjin, which was inaugurated on 7 May 1920.Because of sabotage by the troops of the Fengtian clique when they retreated from Beijing, the Nanyuan Aviation School was closed in 1928.Lee moved south to serve the Kuomintang government, and was appointed deputy director of the Aviation Corps of the Central Military Academy, which later became the Republic of China Air Force Academy in Jianqiao, Hangzhou.