Choose very carfully considering that your design for your airport will depend on the location. I like Oahu(1), So. Africa(2), and Coronado(3). There are too many airports in Cali. already in my opinion.
I think when your considering something like this you should look at your collection, and from looking at the link on your signature i would go for the california option, but thats just my opinion.
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Grob Vigilant ZH-248 UT 645 VGS
Pick based on your collection - do the airlines you have really operate there? Do they operate the same types of aircraft? Answering those kinda questions will help you decide yourself.
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Manek Computers are like air conditioners - they stop working properly when you open Windows.