Apparently there's an issue with viewing xONEx itineraries on AA.com and the AA mobile app. I spoke with someone at the RTW desk and they acknowledged the issue. I'm not sure why it's happening because it doesn't seem to impact if you have your AA number on the trip and pull it up when you are logged into AA.com ... But for some reason I can't access from Manage Trip.

Which airline was the xONEx booked with?

As I understand most oneworld airlines use Amadeus. AA is still mostly Sabre (though it used some Amadeus components).
So it's only ever been a portion of flights that touches AA that gets sent to AAs system.

Just saw your post.
Wow, problems since 10 April!
Past four days, I've tried viewing my DONEX booked over a year ago on the AA RTW Desk.
I needed to make changes - this went quite smoothly despite being blind. Three phone calls with different reps (made changes, called back to pay, called back to get specific details on the flights)
The AA RTW Desk cannot email me the itinerary. I can't view it. One agent told me that AA did an update and the whole booking system was down for several days.

Mystery.
I do not have an AA number attached to the DONEX.
I checked a regular round trip flight booked for one of my kids - AA booking with AA codeshare for BA flights. This booking code is also not available to view. It also does not have AA number.

Any luck logging in yet?

Further to above,
Since the origin of the ticket, when I log in to other FF programs to view the booking - it is completely messed up. Almost every old flight segment (voluntary changes and not) is on the booking even though they don't exist. I've got multiple same city pairs showing for different dates, much of it in the past and has not been flown, and much of the changes that I requested don't show up.

I'm surprised by the big mess.
And surprised that AA can only give me my current itinerary verbally.

I booked the DONEX in early 2024 for a mid January 2025 start. So despite wanting an October 2025 end, I had to book everything in a two month window.

No luck still.

My experiences have been if any money is involved, then a new ticket is issued with the entire itinerary, including flown segments, is to your email.
I do not know if this works for those itineraries without a CX segment, but I could see the entire itinerary with a break down of the taxes and fees as AA put them in on the CX website. The trick is to use the Amadeus PNR as a guest and have the itinerary sent to the email address on the itinerary. Ignore the error message and check your email.

Interesting workaround. I don't have any CX segments but was able to access via amadeus PNR.
I ended up getting 2 emails from CX. One showed my originally ticketed itinerary and the next email showed my current one after I had made changes a month ago.

However, trying to pull up different DONE4 tickets (also lacking CX segment) did not work via Cathay.... so YMMV.

I do this sometimes, but there are times when it doesn't work, though not often.

Interesting -- I believe I found a workaround.

You can pull up your receipt using your ticket number: https://www.aa.com/your-receipts/#
If you don't remember your ticket number, you can find it when accessing your booking on RJ.com (using amadeus PNR)
If you don't know your amadeus PNR, then you'd have to call AA.

Again, this only works if you ticketed with AA.

How did you book an itinerary over a year in advance?

you can book almost a year in advance , and the ticket lasts for a year from the first flight taken. Obviously, you'd have to move the dates forward as time passes

It�s been a pain.

I booked some time in March 2024.
The first segment had to be correct - so our ticket started 19 January 2025.
And each subsequent segment had a dummy date over the next several weeks with the last segment flown slotted on the last eligible day one year after the booking date.

Down side of this is seasonal flights are not necessarily available so can�t be booked. I wanted DFW-YUL but apparently no one wants to fly to Montreal in February, brrh.

Got excited there. I was able to pull up the receipt on that link. But the receipt only shows segments up to February 25th.

Yay!
This CX email tip worked for me.
The 7th and last email from CX is correct. And now I even have a record of the cancelled flights that caused rebooking.

Many thanks!

(I did have a CX segment)