Ahh, you are absolutely right,
Al B. It must be a cut off with the connection time for these two flights.
By the way I found a good route map for South America on the Varig website. It doesn't show the AC flight SCL-EZE e.g., but I think it's good enough for my purpose. Actually, there are not that many flights on *Alliance in South America apart from the Varig flights within Brazil and to the capitals of the sourrounding countries...quite disappointing.

...whish Lan Chile would be *A member...