Originally Posted by
nk15
Terms and conditions Expand - American Airlines upgrade awards are valid on individual published-fare tickets on flights marketed and operated by American Airlines. Mileage upgrade awards are not applicable on codeshare flights and don't apply to award tickets or Basic Economy fare tickets.
https://www.aa.com/i18n/aadvantage-p...with-miles.jsp
Marketed means coded as AA xxx, not sold as a 001 ticket
That's exactly what it means.
What you referred it's just AA upgrade chart, it also has partner upgrade chart.
https://www.aa.com/i18n/aadvantage-p...r-airlines.jsp
IF you had tried, you will know. under normal circumstances, ie BA ticket (125 ticket stock) booked on AA, you are NOT able to upgrade by AA. (I thought this has been widely discussed, AA can't touch BA stock unless under airport control). And this is very common across all airlines.
The opposite, even if it's NOT operated by AA (ie BA, although it needs to be higher fare bucket, you still able to upgrade on certain BA, IB operated flights).
So your answer is exactly the opposite to the reality.