EU 261 for more complex tickets
I've looked in the EU261 thread, but cannot find an answer to my query.
I'm looking to visit the Caribbean in December to watch England play cricket. The cheapest J fare I can find is routed LHR - MIA - BGI, returning GND - MIA - LHR. The TATL legs are on BA metal and the shorter hops from MIA to BGI and back from GND are with AA. The ticket would be issued by AA with all flights having an AA number, and would be about £2k cheaper than a direct BA flight.
Where would I stand if any of the 4 flights were delayed, resulting in > 4hr delay on arrival at either BGI outbound, or LHR on the return. If a delay to either flight into MIA resulted in me being stranded there, who is responsible for duty of care, the airline that caused the delay or the airline that is providing the onward flight.
As an additional point, how long should I allow for the connections in MIA?