This is a problem I've noticed on a few airports so far in FS2004. The ones I remember in particular are JFK and SXM.
At St.Maarten, I parked my Cessna on the beach, and waited to see one or two AI planes land on my scenery improved airport. But as a Continental 737 appeared 10 miles out, it was at FL100. It then made a nose dive, leveling out around 1500ft, and then "touched down" in the sea, some 2-3 miles from the airstrip. At the same moment ATC told them to contact ground. The plane then continued skidding across the water, at final approach speed, up onto the beach, over the road, through the fence, and onto the rwy, where it finally engaged spoilers and stopped, before taxiing off as usual.
However, this does not happen all the time. The first time I tested out the new scenery for SXM, a AA757 did the same thing, before the Continental 737 landed as normal afterwards.
I've also noticed a few AI aircraft appear about 10 miles out at SXM for landing, but at insane altitudes, resulting in missed approaches.
Anyone know what's going on, and what I can do to fix it? (I suspect an Afcad might be worth trying, but will it help AI on approach to the airport?)