This is really to the administrators of this site. Would it be possible to show within the Airport Location Data, whether the airport location is, or is not, within the city limits? This information can be determined in other ways, but you have most available information - this just another piece. It's main impact is a tax related issue, that may help determine where you keep your aircraft, particularly in states such as Kentucky, which apply taxes at the city, county and state levels - all different.