A320Fan - your response is off-point. Given the OP's note, it seems like the situation in Mexico was/had already occurred before the passenger started the first leg of the journey. Had the passenger booked directly via AA, s/he would have been notified of the connection issue and had the opportunity not to start the journey. Obviously, because of (somewhat non-transparent) way in which codeshare flights are handled, the passenger ended up losing the day of travel.
I don't think an entire roundtrip compensation is required here but the ticketing airline does have additional responsibility.
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