I remember when I did my motorcycle trip to Mexico. 6 weeks, from Baja to Chiapas. Everyone thought I was going to die. Everyone thought that years later they'd find some jungle tribe of aboriginals wearing pieces of my motorcycle in their noses.
They were of course had bought into the xenophobic BS promulgated by our media to keep us afraid and buying the products they advertise. I had the best time ever. The people who were supposed to be so violently angry at Americans were curious and friendly.
My only proviso is pilots are perceived (sadly, but mostly correctly. Most of the people in those lands are desperately poor) to be rich, and local governments might try to squeeze an airplane pilot for cash. I would take a bike down there in a heartbeat. Most people perceive bikers as poor, ill mannered, and dirty. But were I taking an airplane I'd want a lot of info about what to do about all the local governments.
To be honest, my bigger fear would be what to do about all the hostile terrain. Big deserts, big jungles, and the Andes. Also, is the 170 a VFR ship? They get plenty of weather down that way.
Do get some good pictures of Ushaia and Tierra del Fuego. This can be done, but I think needs to be done wisely. I don't think there's a trip on Earth that spans continents that can't be done without problems with authorities.