Originally Posted by Goldorak

Is this is a rebooking to a non-ST airline during an irrop (ex : you misconnect or you have a flight cancelled just before taking it), yes, you can ask FB to credit the miles & XP according to your original itinerary. But if the rebooking to a non-ST airline happens weeks/months in advance because of a schedule change, I don't think you can ask for crediting to FB as your ticket is not anymore with AFKL. Other posters here may have a different experience, and I will be happy to be proven wrong on this case, but that's how I feel about it.