With the introduction of Contract Air Mail (CAM) routes, however, the newly formed Western Air Express Company (later Western Airlines) ordered six Douglas mailplanes. The M-1 was adjudged successful, but no production order was received by Douglas. During tests, extended exhaust piping was installed to keep fumes away from the pilot. The M-1 was a straightforward conversion of the O-2, with the forward cockpit covered in sheet aluminium to form a reinforced mail compartment with access through two deck hatches, the pilot being located in what was formerly the rear (observer's) cockpit in the O-2. It had twice the payload of the DH-4, but made use of the same tried and tested Liberty engine, of which large numbers were in store and readily available. The Douglas DAM-1 (Douglas Air Mail-One), quickly shortened to M-1, was test flown during the spring of 1925. A decision was thus made to order a conversion of the Douglas O-2 observation biplane, which had been ordered into quantity production for the US Army. But please keep in mind that if this plan is not vector, if you enlarge it too much the quality will be degraded.The US Post Office Department had been responsible for US internal air mail routes from 1918 onwards, and by 1925 the various types of DH-4 biplane which had been primary equipment since inception of the service were worn out. Also, using the measuring tool make sure all the parts fit together and have the correct size.
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