Sorry for starting a new thread, but I think it deserves it. The official press release just came out:
https://www.oneworld.com/news/2020-0...rld-on-1-April
Notably, the press release didn't mention anything specific about LATAM, so I guess it's safe to say that LATAM will also work with AT and LATAM will not depart earlier than expected.
Mod: Please feel free to merge if deemed appropriate.