<<Also, you can pass UA and AA miles through diners during the promotion with no melt if you are interested.>>
Forgive me, but what does that mean?
And are BA miles basically interchangeable with AA miles, meaning that if one has any interest in accumulating AA miles, he/she should take advantage of the Diners/ BA double miles promotion?
Additionally, can miles from One World partners be "mixed and matched" when booking award travel?