In Chapter 7 of "Fate is the Hunter", Gann reflects on a delivery of a Lockheed Lodestar from the US to Rio de Janeiro. This is the first of four parts, covering the leg from Arequipas, Peru to La Paz, Bolivia. Gann and Parks flew thru the pass at nearly 18,000 feet....without oxygen.Interestingly, the pass from Arequipas to Puno, on the western shore of Titicaca, is only about 14,700 feet ASL. Perhaps, due to the limited information and charts available in 1940, Gann and Parks didn't know about it, or possibly weather made it impassible.
I used the DC-3 for the mission, but see the readme for instructions on converting the mission to another plane. I was not sucessful in finding a Lodestar, but there are some nice Electras out there that would be a nice match.
Be sure to collect your Reward Code at the end of the mission, you'll need it for Part 2. Details in the readme.