Commercial aircraft and their pilots are rated either category II or category III for restrictions on flying instrument approaches. Cat III allows the aircraft to shoot the approach in much poorer visibility (lower ceiling and less visibility) and descend further than cat II. Under foggy conditions being cat III can often make the difference as to whether the aircraft will be able to land.

I was wondering if anyone knew of a site that listed which airlines and which aircraft were cat II vs cat III. I know essentially all of the newest aircraft are cat III, but I believe some of the older 727s, 737s, etc are still cat II.