I just went through an interesting experience being rerouted by AA on a DONE4 ticket and thought I'd share it with y'all and solicit comments.

My NA portion of the trip included LGA-DFW-YVR-JFK, because that's the only way to get to Vancouver and back without breaking the transcon rule. There I was, at 10:30am, leaving home for a 1pm LGA-DFW flight. Just as I'm heading out, I get the flight notification that my flight is delayed. Looked at the new arrival time and realized that I'd miss the connection in DFW. I was on the last flight out that night. Called AA, and they suggested that if I can make the 11:30 out of LGA then all would be good. Well, I finally got to the counter 7 minutes too late to check bags for the 11:30 (which was on time, naturally).

The poor agent spent at least 30-45 minutes working on my situation trying to figure out how to get me to YVR. She almost rerouted me on Air Canada, but said that because of the way my tickets were issued (by the BA IST office, hand-written and these particular flight segments were revalidated for a different date with a yellow BA sticker instead of being totally rewritten) she said she couldn't do it, and that the flights had to be on AA only.

Finally they managed to rebook me on JFK-SEA-YVR, with the last leg being operated by AS but booked under an AA flight number. I got to my hotel about 5 hours later than planned, but at least I got there and it was more-or-less still the same day (3am).

Kudos to the AAgent and her supervisor for getting me there because the routing I took is not valid on a DONE4, not to mention the ticket not being valid on an AS-operated flight. However, I have more of these revalidated tickets with the sticker, and I'm wondering if there's anything I should be aware of for the future? Are there any rules that I should be aware of and be able to suggest to the agents if I'm stuck in a similar situation in the future? The rest of my trip puts me on QF, CX and BA flights. No more AA segments left.