I was just looking at the oneworld circle trip explorer rules, and just thought of something pretty interesting.. there are no mileage or sector restrictions.. only restrictions I see is that you can't fly the same city pair more than once...
so basically, does it mean that if I have no stopovers on a circle ticket, I can fly Africa-Europe-Asia-Africa, and fly every single destination within Asia offered by CX, and every destination within Europe offered by BA?