So to further push, do you think a 2 hour connection in FRA from the US to ARN is feasible? Do your posts mean that even though I enter the Schengen zone in FRA, I don't clear customs with my bags till ARN?

How about a 1:25 connection in ARN from OSL to the US? I presume bags can be checked the whole way for this one, since its Schengen to Schengen and THEN to the US.