In September 1927 the Curtiss JN-6Hs were retired and the squadron gained Consolidated PT-1s and several other trainers until June 1928 when new Douglas O-2H observation aircraft arrived. During the next 10 years, the 111th performed outstanding civic service to the State of Texas, dropping medicine and relief supplies to many of the towns that were isolated by floodwaters, tornados, and fires. New Douglas O-38 observation planes were received in January 1931. By 1938 the squadron was flying both Douglas Douglas O-43As and North American O-47s.