Originally Posted by Guy Betsy
If you show both your tickets, BA should be able to interline through to final destination.
Although BA "should", they almost certainly wouldn't, if the connection is to a Non-OW carrier on a separate ticket.
This fact has been mentioned ad-nauseum in various threads on the BA board.
From AskBA:
Question
If I am travelling on a British Airways flight and connecting onwards with another British Airways flight or oneworld flight, can I check my bags in for the whole journey?
Answer
Yes, as long as you have a same day connection you will be 'through-checked' to your final destination, regardless of separate tickets.
This means that your baggage will be labelled through to your onward destination, and you will have your boarding card for your next flight.
In this case, you do not have to check-in again or collect your baggage, just follow the Flight Connections signs and make your way to your departure terminal.
You can still be 'through-checked' if changing terminals at Heathrow.
The above is valid provided you are able to produce proof or documentation of onward travel and that the connection is within airport minimum connect times, is within the same day and meets local country restrictions.
Please note: When travelling to the US the bag can be labelled to the final destination but passengers must collect their bags and clear customs at the first US point.
Please also note: In some circumstances an airport may not be able to through-check your bags via London, therefore if your baggage receipts show the destination LHR, LGW or LON, you must collect your baggage at Arrivals/Baggage Reclaim before checking-in for your next flight.
If you are connecting between Heathrow and Gatwick airports, you must follow the Arrivals/Baggage Reclaim signs and collect your bags.
This policy covers British Airways flights and oneworld flights only.