Back in the day Comair got S3 priority on Delta mainline and got six S2 passes to use on mainline as well. It was great! After the merger, Comair, along with Mesaba and Compass were moved to S3C. S2 could only be used on the respective carriers. S2 passes are worthless. We already get priority on our own metal as S3. DL mainline goes S3C on us, so maybe that wonderful S2 might bump you ahead of a more senior SKW employee. Except when you so that, that said employee will just check in as S2 as well. And you just wasted your worthless S2!