I'm trying to check in with LATAM and it's only possible to choose several seats in the whole plane, none of which are by the window, even including premium ones.
Since I tried to check-in as soon as it was possible (3 days before the flight), I don't think they have all been selected by someone else.
Is it possible they are only available when checking in on the airport? Or is it more probable that they're available for some selected passengers / other fare classes?