Redesigning an Airport

I'm thinking of redesigning my local airport for FS2004 and or FSX.
Are the airport facilities compatible between FS9 & FSX?
And more important... (to those who have made real airports)
What info should I anticipate needing? I know about getting LAT & LONG I have access to a GPS. Is there anything else I should anticipate needing?
Are the airport facilities compatible between FS9 & FSX?
And more important... (to those who have made real airports)
What info should I anticipate needing? I know about getting LAT & LONG I have access to a GPS. Is there anything else I should anticipate needing?