A330 is used for any aircraft in the A330 family. Northwest currently has five of the A330-300, which seats 298. The designator for the -300 version is '333' in the schedule.

Next year, Northwest will begin receiving the A330-200, a longer range version of the A330 family. I don't have the specs in front of me, but I believe it will seat around 245 to 250. The designator for that aircraft will be '332' in the schedule. When that aircraft comes online, use of A330 by itself won't really help you figure out if its a -200 or -300 variant, so you'll have to look for 333 or 332.....