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Gol is the principal airline for domestic flights in Brazil and it is an overall pleasant experience, efficient and unsuprising.
A little tedious when checking bags (long lines for the outward journey; inflexible with bagage weight during the return, even though it would have been simple to remove one jacket and put it in a different bag three meters away) and when boarding the plane. I didn't quite understand the logic of this process, but it works, as we boarded quickly and efficiently.
Minimal snacks (water, Pepsi, and cookies that were, let's just say, particular).
But all the essentials are there, and that is what is most important.
A few small bonuses: a flight attendant who spoke some French, aisle arm rests that could be raised (my travel companion and I were each on opposite sides of the aisle, so that was practical), and exiting could be done from the front and back of the plane at Iguacu.