This almost happened to us in December at the Miami airport. Our AA agent for our flight to Santiago started asking us lots of questions. She told us we needed several forms completed before she would check us in. These forms all were required for travel to EasterIsland. She wanted the name of our hotel, all kinds of info. We were going to Easter Island a few days later, not directly. She was very unreasonable and insisted we needed them, while we insisted we did not, as our tour guide was handling all that. After a long back and forth, she went to talk to a supervisor (which we had asked for several times). She was gone for 20 minutes. She finally returned and said, well you don’t have to have them done now, but you will-later. And made some snide comment about she knew something we would need done and we would find out after we got to Chile. We were so aggravated that I never got her name, as I would have reported her. Luckily we were there very early so we did not miss the flight.
Recently on another site, I read another traveling toChile had the same issue at a different airport. There is something not clear in the AAregs about travel to Santiago.