Lan Argentina should have the same status as Lan Ecuador. Lan Chile will own only 49% of Lan Argentina (as in Ecuador, in Argentina a foreign company cannot own a majority share of a local airline), that makes it 1% less of what is necessary to become a subsidiarie, 1% less of what is necessary to enjoy automatic inclusion in Oneworld under Lan Chile's membership.

Since Lan Argentina will be a completely separate entity from Lan Chile, the airline would need to be made a Oneworld member on an individual basis before being considered a part of Oneworld.