Emery (CF/CNF) did the same thing, they used contractors for pickups beyond a certian mile/area, usually ugly freight, and they used company drivers (7) to deliver early/guaranteed freight and p/u desirable/quick loading/unloading freight- within the city limits, only to have a linehaul contractor (CWF) take the freight to the airport. You were lucky to work 7 hours a day, great numbers for them. Working the dock was no option. The management had that covered.
The majority of the terminals were closed by 2200, the freight was loaded on their "purchase" trailer having to be there by 0600-0700 the next day. Conway truckload (at that time) was used.
They were purchased by UPS/Menlo Logistics the last I heard.