Originally Posted by
econjon
Quick question: Can we book the trip using BA miles for 3 of one ways? And AA miles for the last oneway?
You can book o/w on both BA and AA. From what I've seen, AA might be more miles for the same trip.
AA's award chart for partners
BA's award chart for partners
By the way, ThePointsGuy did a great review of what you can do with BA miles in several posts. It's a great source of information - here's
one. I also recommend reading post 8 which talks about how to use stopovers.