Lost airport coordinates in FS9-'Create Flight'.

Hi there,since a couple of month I'm having troublewith FS9 when selecting an airportin the 'create flight'-menu.With most of them, except for the runwaysno other starting point like ramp e.g. can be selected.The coordinates of others are far from goodand will put you somewhere in the middleof an ocean or right into nowhere.I'm aware that I could reinstall FS9to solve the problem, however I spent a lot of time in tuning the configs and adding addons, also I would like to learn what lead to the problemor at last where it can be solved.So my questions is about which certain file(s)are responsible for airport coordinates,so I can replace them with the original one(s)from the FS9-CDs?(Supposing this would help!)