You can't logically compare DAL pay rates with UPS and FedEx, because their business model is nothing like DAL's. And SWA's business model is not very much like DAL, so I wouldn't compare DAL's pay with theirs, either.
Just because someone else flies the same plane as you do, doesn't mean that your company has the ability to pay you the same thing they do. Revenue generation per seat-mile/aircraft mile/dollar invested, etc. is radically different at UPS and DAL.
cliff
ANC