@GetSetJetSet
Only on US metal. They have discounted Biz and Coach flights to Europe Jan 15 - Feb 28 each year (also to S America in April, I believe) for 30k/60k RT. If you have a US Air cc, subtract 5k miles per ticket (applies to all award travel on US, not just during off-peak times). Not sure about stopovers, but probably - I think all normal award rules apply. You have to book a bit in advance though if you want to be particular - award seats open 330 days ahead of time.