Gosh, I didn't intend for that to get so long. I hope it's helpful for somebody.
If I could have changed one thing on the trip, it would have been to bring my wide angle lens for my camera, and if I could have changed two things, it would have been to take LAN instead of Tans for the flights to CUZ and PEM, but those are pretty minor things, I guess.
I looked through my pictures, and all the ones of the Tans Peru plane we took have the tail number obscured, so I don't know if we were on the doomed plane.