77 Terrett, Emergency, pp. 88-94. The Air Corps flew the mail from February to June 1934. For details, see Maurer, Aviation in U.S. Army, ch. 17; Flammer, "Meteorology in U.S. Army," ch. 4; Coffey, Hap, pp. 156-58; Foulois, Memoirs, ch. 14.