Summary of Changes
From 1 June 2016, the oneworld policy on accepting customers travelling on separate tickets was changed.
BA, along with our oneworld partners, has implemented this change in policy which is as follows:
Only those customers that have separate tickets issued in the same PNR/booking will be accepted for through check-in.

How to handle customers with separate tickets in different PNRs
Customers that have separate tickets issued in separate PNRs/bookings will not be accepted for through check-in, regardless of which carriers they are connecting on to, including BA or any oneworld partner.
These customers, and their baggage, will only be checked in to the destination showing in the system. No on carriage details are to be added into the check-in system at any stage. Please note that where a customer has separate tickets, the Most Generous Allowance (MGA) rule for baggage does not apply and any excess baggage will apply as per the ticketed sector for that ticket