NW reported a 30% drop in bookings to China in 2008 (vs. 2007), despite the Beijing Olympics. Obviously UA isn't NW, but I'm sure it's experienced a significant drop in bookings as well:
http://www.aviationweek.com/aw/gener...NORTH12248.xml
And AA employees are reporting elsewhere that ORD-PVG has operated with 30-50 passengers several times.