Signed agreement I suspect.

Such as that referred to here: (https://ssc.aa.com/prmportal_enu/Age...ng%20Index.pdf)

Thanks I didn't spot that

I've been at sin for the past 11 hours : 6 hours for the flight cancelation to be announced and confirmed and another few hours trying to speak with qr ground staff to get rebooked on another carrier.
The station manager told all passengers they could choose to take the rescheduled flight (from 920pm to 5pm the following day), take the next qatar-operated flight out to Doha in the am, or get rebooked on other carriers. I chose the last option but it was a nightmare trying to get close enough to the ground staff to even get them to help you (about 200 passengers affected, maybe more).

I searched for my own flights in order to still have time to acclimatize or even just meet the trekking start date and came up with
Sin-dxb-mad (emirates 433 /143)
Mad-lim-cus (lan 2707 /2023)
Which will arrive 3 hours after my originally scheduled arrival.

I wrote all these down on a piece of paper and showed it to the staff together with my boarding passes for qr and itinerary for aa. I also mentioned that aa policies covers reacommodation. (They were doing reacommodation for all the qr flights anyway). She took about fifteen minutes to figure out my flights and ticket them using something called a flight interruption manifest. (This document is not a confirmed ticket though, you still need the carrier to issue your boarding passes.)

I believe they will cover you if you take the initiative to give them all the info they need. They are under too much stress from all the other clueless passengers who are asking them what is the solution for them.
Sorry for the long rambly post, I've been 24 hours without sleep.

TL;DR
Propose your own flights, give them all the documentation. Basically help them to help yourself.

Always good advice

If QR endorse your ticket onto EK I shall be very impressed. You may want to have a plan B on oneworld carriers only.

Good luck!

Boarding passes already issued, I'm waiting at the gate
We're a party of three so that makes it extra hard (to rebook 3 pax on 4 flights).
I couldn't find any other plan that didn't involve more than 36 hours of flight time.

Brilliant result.

Enjoy your trip.

You seem to have it all in hand, but just in case, your return coupons on AA (and indeed QR) may be cancelled, so I suggest letting AA know if you didn't already.

Yep, did that last year with US. Had a booking on CAE-PHL-LGA. Weather and ATC delays at CAE was causing many flights to be delayed to the point I'd miss my connection. By the time they announced the issue and asked for people with connections to contact them, I'd already noticed the problem, found another option and was heading towards the ground staff.
They kept trying to keep me on the same routing and put me in a hotel overnight at CAE or PHL until I pointed out the CAE-CLT-JFK option which had minimal delay and no forced overnight.

Thank you for the advice, I will get in touch with them as soon as I've had some rest

Esta may still pose a problem as we will transit via MIA on the way home. *cries

If worst had come to worst, they could have booked you on CAE-EWR on UA

Exactly! They can't be keeping track of everybody's itineraries so it's always good to know what your options are.

A very good result. Having the alternative airlines & route is always good
Keep all those EK and other boarding pass's. You should be able to put these flight to some ffp.
And then claim "original routing credit" for the flights you booked & paid for

Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)

Sounds like a very good result, but I wonder if you could have asked to be re-routed via the Pacific rather than the Atlantic? Something like SIN-HKG-LAX-LIM-CUZ? (Not sure which routing would involve the shortest total trip time.)

I did look at the hkg-usa option but seems the next available flight for me involved a 7 hour layover in Dallas.

About 10 years ago I was flying PRG-LHR(BA)-MIA(AA), and the BA ticket agent in PRG was unable to print baggage tags thru to Miami. I insisted, but I was so discouraged at the OW 'Alliance' whereby I had to clear customs in LHR to collect my bag & recheck for my ongoing flight. Very disappointing.

Long time lurker, appreciate all the knowledge and contributions on Flyertalk.

I have read this thread with interest and would appreciate if anyone could point me to a specific post that offers some official confirmation (or information I could provide to an agent if in need) for the following scenario:

JFK-LHR-TXL on BA and totally separate ticket TXL-MIL on AB

If I understand correctly, even though flights are on separate tickets if delayed and connection missed because these are both OneWorld airlines they would still get me to my final destination, Milan?

Additionally, this thread references getting agents to check through all boarding passes. I have not had luck with that in the past. For example, would I ask BA at JFK for my TXL-MIL boarding passes?

I appreciate your help!