It wasn't a DC-2. It was a stock DC-3 that Donald Douglas presented to Hap Arnold when Hap needed a personal transport.
The contract for the C-47 was two years in the future, so the Army Air Corps called it a C-41.
I think that the AAC had been buying a hybrid DC-2 fuselage on a DC-3 wing (don't ask why) and called it a C-39.
Anyway, the C-41 was supposed to go to United, but Donald Douglas presented it to Hap Arnold at Boling Field in Washington and Hap said "send me the bill", or something like that. Then his daughter married Douglas' son.
Jen and I had that airplane on the US Airshow circuit in 1997 since it was the 50th anniversary of the USAF as a separate service.
There are a lot of very funny stories that are related to that summer, but Jen and I (and our pissy young F/O) had a DC-3 to ourselves for about three months.
There are photos on my website on the aviation and DC-3 pages:
http://www.chamoismoon.com