Did the OP or anyone else happen to book this recently?
I was looking at TXL-OSL-KEF all on SAS but on the way back it is only letting me pick flights back through ARN/CPH with the KEF-ARN/CPH on FI in the 752.
If I booked SAS Plus would that go into FI's Economy Comfort with the middle seat blocked?
I'm crediting to UA MileagePlus so I have some limited options and just having to bite the bullet with the trip back from KEF not earning any miles.