They've had stopover awards as far back as I can remember at 35,000 miles - but of course you could only get it if all segments had standard availability - I don't think there was an EasyPass option. It's come in handy a time or two, especially since a (domestic) stopover is not an option with United awards. (or at least, not back when I needed one last). As Entropy mentioned, most all international awards include a free stopover.