I don't think there's a list anywhere. But some common routes are some flights between the hubs (SFO-IAD, SFO-ORD, LAX-IAD, LAX-ORD, DEN-IAD); sometimes SFO-BOS, sometimes SEA-IAD.

And of course, there's always p.s. flights from SFO/LAX to JFK -- C on those is not quite as good as international C, but it's still better than domestic F.