Netflix receives preferential treatment and specially designated containers due to the volume of mail it sends through the system. Judge David Sentelle noted, "Rather obviously, this is not without cost to the postal service. Nonetheless, the service provides it to Netflix free of charge."
The latest ruling is a continuation of the multi-year dispute by GameFly, which claims it's had to make adjustments that cost millions because the postal service won't give the game rental service the same treatment.
Update: GameFly has sent us an official statement regarding today's ruling. Posted in full after break.