The Delta flights I recently flew between ATL & SCL flies overnight in both directions. If the plane arrives into SCL at 10 in the morning and, theoretically, departed for a return by noon from SCL, it could be in Atlanta by 7 p.m. Probably good to catch the last bank or two of departures for connections. But instead, the 767-300 ER (presumably) sits on the ground in SCL (depreciating) for up to 12 hours. Now that I think about it, all the Delta flights to South American I've been on are like this (overnight in both directions). Is this just what all American airlines do for flights between these two continents? Is this because of logistics or not enough connection opportunities on either end (if they arrive later on in the day) or maybe even a political thing?