Its main claim to fame would be as the most numerous aircraft used in the Chaco war, where it formed the backbone of the Bolivian Air Force.

[6] The militarized C-14R had a large cutout in the trailing edge of the upper wing, redesigned cabane struts and it had the cockpit shifted forward to allow room for a gunner behind the pilot.

All surfaces aside from the aluminum panels on the top of the forward fuselage were covered in doped aircraft grade fabric.

[5] The split axle undercarriage used oleo-pneumatic shock absorber struts, dispensing with the bungee cords used on previous Travel Airs.

[8] Although intended as a replacement for the Travel Air 4000, the era of the three seat open cockpit biplane was ending, and the Great Depression was further dampening any sales prospects.

The only significant civilian sale was to the Union Oil Company, whose order of two A-14Ds (msn 2006, NC12307 & 2007, NC12310) were only to replace their well-used Travel Air 4000s.

Although the Bolivian C-14R Ospreys were the most widely used aircraft on either side in Chaco war, additional airframes were anticipated but were never delivered.

[8] Shortly after the last examples had been made operational, The Air Force reorganized its aircraft into units that were named for their most important type – and so the Osprey escuadrilla was formed.

[12] Argentina was at that time maintaining a position of neutrality while supplying Paraguay with equipment, but would have posed a serious threat to the Bolivians had they declared war.

As it was, despite pilots flying Ospreys providing ample warning of Paraguayan movements, Commander Hans Kundt's failure to act during the Campo Vía pocket resulted in the greatest military defeat suffered by Bolivia,[15] crippling their defences, and hastening the end of the war, to Paraguay's benefit.