Wow, VS744, how do you have so many posts? You've only been here 2 days!
NW has about 40 747s, I'm not sure of the exact number.
In my opinion, Northwest is an excellent airline, and I can't wait to fly them for my next trip, in about two weeks. Their service has greatly improved since their low point of 1998, and they are America's number one on-time airline for 2000 so far, beating Southwest and everyone else in the numbers. Give them a try- I think you'll be impressed.
Create your own luck.