I think the frequent flyer line should be a benefit of SC. I say this for two reasons:

1. If your'e not FO or above, you're shelling out 450 per yr to DL. That should get a benefit up front....like with lines.

2. Very few SC members aren't already skypriority.

But the "value" of the sky priority line varies depending on times/airport.

AZ, however, in FCO does have a great lounge.

Dave