Originally Posted by
Jagboi
That might be a concern only if the rest of BA's IT was beyond reproach. Since we live in the real world, we know it isn't and all sorts of errors and weirdness can and do occur with BA's IT systems. However, a simple reminder that a passport has less that 6 months validity remaining is a useful reminder.
Similarly, when flying on a domestic Canadian flight they noted at the gate that my drivers licence was about to expire (that was what I was using for ID to board) Since it is only renewed every 5 years I had forgot, so the airline reminder was useful to me. BA could do something similar without much difficulty.
It might have some use, but it would not have prevented the OP's predicament as he stated that he assumed it was fine as his passport was still valid on his return due date. Had it got to be individually useful and given advice for an individual journey then we end up in the murky waters of slippery slope and issues of responsibilities for changed policies and errors.