I don't get AA mailers anymore. I'm not sure why. I have had about 6 AA cards over the years. The last one was closed in March 2016. I presently have a AA CitiBusiness Platinum Select card. I applied for that directly from the Citi website.
I checked my AmEx account and it didn't have the upgrade offer.
I am under the Chase 5/24 but I think I have exhausted all of the personal cards that earn Ultimate Rewards. I will have to look into the available business cards.