Originally Posted by
G-ARVE
Interlining luggage remains a grey area to me, so I invite others more experienced in these matters to offer their views and advice. ................... Each leg is on a separate PNR though I suspect that is not relevant these days............ .
My bolding - in my experience with BA and AA, having separate PNR makes all the difference. AA and BA are NOT interested/willing to interline even to their OWN flights if you are on separate PNRs. So I think your concern is justified, especially if this restriction has rolled over into a general OneWorld alliance policy.
I have no personal experience of Qatar or MCT as a departure point - but I am sure someone who does will be along soon. Good luck.