Just so you know, brazil is the only flight to South America that offers BuisnessFirst which is better than Latin First. As far as convinience, you might want to try Copa airlines out of LAX (LAX-PTY-SCL). There service is similar to CO and I think CO owns some of copa. I also believe that the flight going south is a red-eye departure out of LAX. If that doesnt work than DL is your other option through ATL.