This is really only on here to show the route as we only changed planes (sorry Santiago). However, a brief note on Chilean security dumbness. To get from Ushuaia (ARG) to Lima (PERU), means taking a plane that stops briefly in Punta Arenas (CHI) and then changing planes in Santiago (CHI).
On arrival in Punta Arenas (a whole 35 mins flight compared to the 12 hours bus on the way down), all passengers had to disembark, as this was the point of entry to Chile. Most were carrying on to Santiago and a few, like us, were only passing through Chile. Nevertheless, everyone off was the order of the day. So we got off the plane, went through passport control, filled out 2 forms, had the passports stamped, went through bio-security (Chile being very touchy about bringing veg into the country), entered the terminal, queued up to go through embarkation security, went through security and passport control, had our forms stamped and then boarded the same plane with the same people around us.
You'd think that would at least simplify matters at Santiago, but no. There is no transfer section for passengers changing plane, so we had to enter Chile completely and go through the whole rigmarole again. We now have a ludicrous number of Chilean stamps in our passports.