Not sure about this one. Unless they have changed recently, Alaska’s charter flights are usually numbered 7XXX. This was probably just a plane they were routing through maintenance at GSO. Plus, it’s only 155 miles to drive directly from WCU to Atlanta, versus over 200 to drive to GSO to catch a plane. Why drive farther just to fly?
Hmmm. What about Lufthansa Cargo? I understand Lufthansa Cargo uses the callsign “Lufthansa Cargo” instead of just “Lufthansa.” Though Lufthansa Cargo is a wholly-owned subsidiary of Lufthansa, and thus, somewhat distinct from the scheduled passenger arm. There may not exist any such distinction between National Air Cargo and the current National Airlines.