ATP, all those planes you mentioned require only 2 pilots. NWA has some older 747's that require 3 (the 200 series). That is why you see SO scales on the 747. I believe there was some news recently about Delta planning on getting rid of the 747-200's. NWA used the 200 series for cargo ops out of Alaska. I believe they got rid of the SO pay scales with the new DAL pay scales, but Im not 100% on that.