Cargo years ago, was a very good business. Then cut-backs began, and one of the first things cut was sales reps. No sales reps to make contacts, generate new business, continue relations with existing customers and cargo started dropping off. Contract it out to another air carrier, and they begin to take away your customer. The only ones you keep are the customers that the contact carrier can't offer service on their airline to. When I retired, about the only thing we were hauling was human remains, cut flowers, and (rotten) fresh fish.
I remember the days of old, when it was said that the cargo on the charlotte - london paid the expenses, and the passengers fares were the icing on the cake. Course, I remember making a decent wage, decent benefits for both active and retired employees, also decent relations and respect between management and employees. And, those days are gone too.