For those of you who have not yet done so, try installing the electronic timetables from CO and NW. Both are great tools (when properly updated) that usually provide more information than a simple search on the web. A great example is the actual equipment variation, such as the 752 or 757.

http://www.continental.com/travel/wi.../timetable.asp

http://www.nwa.com/travel/timetable/