Originally Posted by
Squall of SeeD
The matter of Aerith appearing and disappearing when entering the church is either a) some kind of goofy glitch, or b) Cloud's memory of her. If one enters the church even while she's still alive that image can be seen.
You're the only person I know who can see her 'ghost' while she's still alive... of course, I don't doubt your word, but I *do* think this might be a glitch specific to your copy of the game. For everyone else I know, her ghost appears
post mortem, and disappears when Cloud tries to approach.