Heinkel He 116
Although looking like a mini-He 111, the He 116 was instead a multi-engined version of the He 70 "Blitz".
Unfortunately the published history of the He 116 is mostly inaccurate, relying on old research that has since been superseded. This is what is currently known and is in disagreement with wikipedia.
In 1935 Lufthansa requested a trans-Atlantic mailplane, and Heinkel responded with an initial 3 prototypes. The V1 first flew on 9 December 1936, but with multiple engine failures causes by problems with the fuel system, the aircraft was ditched into the Baltic on that first flight. The airframe was undamaged, but the wings were written-off and replaced by those of the uncompleted V2. Once repaired the aircraft was given a civil registration and recommenced flight testing before being used by Lufthansa on the Berlin-Las Palmas route. The V2 soon joined it's older sibling, before it was crashed in 1938.
The V3 was retained by Heinkel, and modified for long-range record-breaking flights. Modified with an additional 2m wingspan and fitted with Walter take-off rocket units, the aircraft was designated as the He 116 R. The aircraft set a record staying airborne for 49hrs9min and flying 10,500km.
Japan also expressed an interest in the aircraft, and an additional 2 prototype aircraft were constructed for export.
With the start of WWII, the remaining V1 and V3 were transferred into Luftwaffe service.
In December 1938 construction began of the definitive He 119 A series reconnaissance aircraft, fitted with a glazed nose, but otherwise not significantly changed from the prototypes. A production run of 12 aircraft was completed for the Luftwaffe, but the concept of a long-range unarmed and unarmoured low-speed reconnaissance aircraft was unrealistic and there was no further production. The aircraft were not front-line aircraft, and spent their time performing duties only over friendly ground.
Another aircraft I was hoping to use in the AU, but a design that was already out-dated and uneconomic when completed for the trans-Atlantic service, potential Germano-Japanese communications or for military application.