I'll be flying from Los Angeles to Prague on SAS Scandinavian Airlines next month. I have a stop in Stockholm. Can anyone tell me how customs / clearance will work? I will have 2 pieces of checked-in luggage. Will I need to pick up luggage in Stockholm and go through customs there or will everything be checked in Prague?

Thanks in advance.

Also, I purchased tickets on SAS GO Plus (Premium Economy). From LAX to ARN, I put in a bid for a business class upgrade @ $450 - would this be competitive (my flight will be at the end of August)? Anyone have thoughts on my chances of the upgrade going through?