If you buy 2 separate tickets :
For example SFO to LHR (Heathrow, London) with united airline.
Another ticket from British Airway: LHR (Heathrow) to MAD (Madrid)
I checked the connect time for Heathrow Airport recommend a min of 75 minutes. We have 3 hours connection time. Knowing how unlucky we are recently with United. They delay the flights due to many reasons. How happen if we miss the connection flight for British Airway due to delay in United Airline? Do we need to check in from SFO first for British Airway? Do we check in the luggage directly to Madrid in SFO?
For example SFO to LHR (Heathrow, London) with united airline.
Another ticket from British Airway: LHR (Heathrow) to MAD (Madrid)
I checked the connect time for Heathrow Airport recommend a min of 75 minutes. We have 3 hours connection time. Knowing how unlucky we are recently with United. They delay the flights due to many reasons. How happen if we miss the connection flight for British Airway due to delay in United Airline? Do we need to check in from SFO first for British Airway? Do we check in the luggage directly to Madrid in SFO?