The problem is in the way they handled flight graphics. In the original FC version, the perspective didn't change in the airship. When they added this for the GBA release, they used a nice special effect that makes buildings stand up instead of simply lying flat. While this looks cool, it makes it hard to determine where you need to land since they didn't change the actual location you need to land on to enter Palamecia. So while the graphic is upright, the landing spot is still lying on the ground a few squares behind the castle. They REALLY shoulda changed that one.