I have a variation on this question. I am flying LHR-AMS on BA and then AMS-DOH on QR on a separate ticket, I know BA is good at interlining luggage between separate tickets on OW (and it should help that I am OWE and in J), but I was thinking of flying out the evening before and having an evening in AMS rather than catching the first BA flight of the day (especially in winter). Will BA through-check luggage with an overnight in AMS on separate tickets?
I see that the OW
website says
If the time between connecting oneworld flights is more than 12 hours, you may need to collect your luggage on arrival and check-in again with the outbound carrier.
but I have a suspicion is that this is an American rule rather than a universal one. Does anyone have experience in this situation?