[3] It was flown to the Detroit Aircraft Show two days later, with minor alterations being made later including a switch from a tailskid to a tailwheel.

Built during 1937 and flown in 1938, the passenger cabin was modified as a cargo compartment with 156 cu ft (4.4 m3) of stowage space, an NACA cowling was fitted, along with a variable-pitch propeller.

The discrepancy from many publications with higher numbers may indicate that from two to nine additional airframes were built, but scrapped without being registered or sold, due to the collapse of the aviation market with the deepening of the Great Depression.

[5] George Eastman of Kodak had his first flight in PT-6[5] The PT-6F was supposed to have been one of three built from parts still available from the original cancelled production run, for an expected Philippine customer, and even carried the Philippine registration of NPC-44, however a lack of funds caused that sale to be cancelled.

[2][6] The aircraft was eventually sold for around $7,000, and made its way to Alaska for a career as a bush plane with Byers Airways.