Originally Posted by
Tommy Two Thumbs
I am not 100% positive on this answer but I do not believe that you can use 500-mile upgrades if your reservation has a AS flight number. Per the terms and conditions they are valid on flights marketed and operated by AA.
you are correct. More about 500 mile upgrades on
https://www.aa.com/i18n/aadvantage-p...e-upgrades.jsp