We are flying from Toronto to Paris. First we are flying on AA from Toronto to JFK on codeshare flight with BA connecting flight departing from JFK to Paris. We booked on British Airline website. What to do when first flight is delayed and there is a chance we will miss connecting flight in JFK?Who is responsible for getting us on a flight to Paris, AA or BA? Do we try to get on another flight when we are in Toronto at the AA desk or BA desk when we get to JFK?