Bumping this thread again... I'm seeing a similar pricing situation (much cheaper to book AAA-CCC via BBB as multi-city instead of one-way). Anyone have tips on where I can actually book and ticket the multi-city fares? I see them on ITA matrix but it re-prices on aa.com and isn't showing up on lots of common OTAs. Any tips on third-party sites that will actually sell the tickets? Thanks!