I'll keep my eyes peeled at Narita tomorrow to see how empty the airport looks. As far as I know, planes are still being filled up but yields are down due to constant fare-cutting and a race to the bottom among the airlines.
I just listened to a BBC report on this, and no, planes are not full, and they bled a billion USD in just 3 months, and are going hat in hand to the gov't, and they specifically mentioned Nagoya and cutting back routes aggressively. The fact the losses are so steep given the drop in fuel prices, which is 30% of an airline's operating costs, is amazing.