I like to use my AA miles for OneWorld awards. Usually, 20K flown miles in J, which cost 130K RDM, work out nicely for us. So that's 260K for my wife and me. I also want to be prepared to buy an occasional positioning trip or a ticket for a family member. So I would feel fine with our accounts totaling to at least 350K-400K. Right now we have a little more, but not to anxiety provoking levels.