Try to play with google flights and look for the following:
roundtrip US west coast to Europe (as positioning and depositioning)
then look for routings like
ams/bru-ord-iah-gru/gig/eze-iah-ord/ewr-fra/txl/muc
these europe-us-south america flights go for roughly 600$ and bring up to 25k pqm
add a cheap TATL and an intraeuropean flight for another 600$ and you should be at it.