Originally Posted by
Dr. HFH
I called the AA RTW desk. To meet the requirement, it has to be AA metal. One thing that she told me was interesting. They can/will book any flight as an AA codeshare regardless of whose metal it is. You can use that to increase mileage earning depending on the rules of the program to which you're crediting.
Be careful when booking an AA codeshare. There may be different availability on the codeshare vs the metal airline For me, no A class on JAL from TYO on the AA codeshare, while JAL metal did have seats. Also, the JV airlines may have better inventory amongst themselves. I thought that to use a codeshare flight the prior flight had to be the same airline as the marketing codeshare airline, AA -> AA codeshare, but not AA -> QR codeshare.