The Andes Online office is new and bright, next to the Aero Argentina office on the main street in Puerto Iguassu (if you can find Aero Argentina in Lonely Planet, you can locate Andes Online).
I booked the flight two nights in advance and they still have seats. They open late. I was there at around 8:00pm. In the flight, they serve fancy biscuits. Planes looks pretty new. It looks better than United Airline.
Flight left at 2:50, 25 minutes early than the time on my ticket (it makes paying premium for the taxi fair worthwhile).
Price: 184p (I argued it down to 170p)
Nothing fancy but clean and modern, staff is friendly. Seems fair for the price. Free WIFI and internet. Breakfast included
From the jungle of Iguasu, I flew into the cultured Salta, whereupon I trespass into a private artists gathering. My pants were stained with mud of the Macuco Trail (in Iguazu Fall), while others dressed in elegance. But they were too polite to kick me out or arrest me.
Everybody seemed to know someone else, and everyone was hugging and kissing someone else. There are artworks everywhere, some tacky woodcraft, some photos of shanty houses, and a whole wall of toilet paper, which I stared upon for minutes, trying to deduce the hidden philosophical meaning, but of no avail.