The DCA-DTW and DTW-NRT (NW 11) had light loads. NW11 had about 100 unoccupied seats in coach, not sure about WBC. The NW 25 was full in WBC but had 75 open seats ion coach. Arrived in NRT about half an hour late, with just about 45 minutes to connect to NW 27. As I approached the gate for NW27, the GA called my name and handed me a WBC BP saying they were over sold and had therefor upgraded me. That was a nice suprise. I was the last one to board.