July 1, 1924 – Cheyenne, Wyoming
According to file, employed by the POD
April 20 – October 20, 1920
March 23, 1921 – February 18, 1923
September 21, 1923 – January 16, 1927
On February 24, 1926, Clarence Lange had to return to the North Platte, Nebraska, airfield shortly after takeoff, due to heavy snow between Gothenburg and Lexington, Nebraska. He was unable to takeoff again until 6:37 a.m.
Lang took a short break from the service in late March 1926, when he reported that he had shattered nerves "due to strain of night flying between Cheyenne and Archer." Lange recovered, and continued flying the mail night and day.
On August 27, 1926, while landing at the Reno, Nevada, airmail field, Lange hit a hummock in the field. The lower center section fitting broke on impact. Also broken were the upper front right center section brace wire fitting, and all struts in the front and rear landing gear were bent.
Occasionally pilots would write their superiors about the performance of some of the aircraft. After a particularly rough landing in one airplane, Lange recommended that de Havilland #393 be "put on the list of ships for sale, for as I understand it has never flown correctly, and this landing won't help it any. Ship 373 or 374, I believe much better and would recommend either of them to replace 393."