2 years back I needed to reissue in SCL because a delayed GRU-SCL flight meant missing my connection to North America and all my onward connections the next few days in The States. Even though it was an LA flight delay they didn't have a clue/the interest/the ability to do a reissue.

I went to AA's little office at the airport (it was a week-end) and they had it all sorted and reissued painlessly within 20 mins.