I recently flew AA from a European country (where I live and where I am a citizen) to the US (where I also am a citizen), and (as discussed for example in https://www.flyertalk.com/forum/brit...-ba-api-3.html and especially in Dual Citizen Traveling from/to the US, which Passport to show/use, where? ) dual nationals are obligated to use (including, ideally, to send ahead via APIS) the passport of the country-of-landing when they fly into a country in which they hold citizenship.

So, from Europe to the US, when I booked the AA flight and when I checked in online for the AA flight to the US, I put in my US passport.
After landing in the US, I tried to update the passport/APIS information in my itinerary on AA's website to now specify my European passport for the later return flight.
The website gave an unspecified error. (And continued to do so over days).
I contacted AA Twitter support - they can't actually change records, they just redirect you to the telephone.

I telephoned AA Reservations (more than once). They were unable to change it; unspecified errors/ the system wouldn't let them.

I went to a major airport in the US and spoke directly to two different AA counters (real AA employees) who also found that the system wouldn't let them update my passport information in my already-artly-flown itinerary. [One of the AA agents, rudely informed me that she had worked for AA for forty years and that I was incorrect that this even matters .... despite my having already explained to her that I happened to work for Delta Air Lines when "Secure Flight" was demanded by the government and airlines' I.T. departments had to comply -- I reported directly to the Chief Privacy Officer of Delta at the time, and I was physically in the room when the Chief Privacy Officer of the Department of Homeland Security came to visit Delta to inform us of the new government demand, and then later I sat with the I.T. teams as they implemented it, to represent Delta's customers' privacy interests), so that AA 40-year employee's attitude just added insult and face-palming annoyance at AA's attitude to the whole problem.]

Since all of this happened, I have communicated extensively with AA "Customer Relations" via email, including trying to cc: an AA senior executive whose contact details I found on the very useful Elliott.org website - I don't know whether that actually was received by anyone in the executive's office. Certainly the later communications haven't improved much and at no time has anyone from AA actually acknowledged the problem.

Have any of you ever been able to change the passport APIS data in an AA - or, really, any airline's - record for an itinerary on which you have already flown the first segment?
While dual nationals are not the most common situation, we're not that uncommon, and per one of the other FlyerTalk threads I linked above, it's; not even just dual nationals who occasionally need to make such an update (such as a renewed passport during a long trip), it seems odd that AA's systems totally block everyone - passenger and employees - from doing this right up until physical at-airport check-in for the next/last leg of the itinerary. (By which time, depending on the exact destination, an APIS record still holding the other-direction's wrong-for-this-flight-leg passport data may have already been sent ahead to the destination country's government which won't want to see that passport).

Any suggestions on how/who to contact at AA to try to get an intelligent acknowledgement of the problem and a potential solution?

thanks,
-Jay