I was looking for a convenient way for a colleague to get to EZE from London. As he is travelling with family an ex-EU or complicated routing wasn't viable.
Adding LHR-CDG leg at the end of the journey brought the price down considerably and makes it a great price out of London!
Stopovers in the US are also allowed. Works for DFW, MIA, JFK.
http://goo.gl/flights/MhjX