When flying to Argentina or Brazil, United (and I believe) American fly from the US late in the evening with morning arrivals. The flights then do not depart until late evening to the USA.
Why do they do this and have the planes sit all day? With the time change (granted only a couple of hours), why would they not fly back in the afternoon with a evening arrival in the US? They do this from Australia to Asia, leave Sydney in the afternoon, arrive into Asia in the pm. Fly back to Sydney overnight.
Just seems like a lot of planes sitting everyday.