FWIW, just had this happen to me and the short answer is NO. I flew LAX-CPH-OSL on one booking, with a one-way OSL-BGO booked in there as I decided to go to BGO last minute and take the train back to OSL from BGO. Anyway, the LAX-CPH flight gets cancelled the day before. I look up my options on United's website, and see several, that will still get me there in time for my OSL-BGO flight, maintaining my booking in Premium Economy across the pond. The system auto re-books me onto LH LAX-FRA-OSL, getting in 6 hours later and missing my original OSL-BGO flight. I called SAS "customer service" to try to get on one of the United flights, or LX SFO-ZRH, but no such luck. Agent says it doesn't matter what United's website shows, they can only re-book me on flights that THEY see on their computer. Pathetic. I ended up buying a new OSL-BGO ticket that departed later in the evening and cancelling the original. I should still be due EU 261 compensation though, no? Submitted that form, see how long it takes SAS LOL.