Today there exist about 250 fly-in communities, also known as airparks, mainly in the USA. A catalyst for this concept was McKinley Conway, an engineer who privately developed Spruce Creek during the late sixties, one of the first fly-in communities near Daytona Beach in Florida. In 1977 Conway published The Airport City. Development concepts for the 21st century, in which he explicated his idea of the “fly-in concept”.
The concept Conway describes has the following characteristics. Fly-in communities are mostly planned along the lines of ribbon development, with the runway as its most important traffic artery and main street. There are two types of houses, that is to say houses that are directly connected to the runway and houses that are connected to the runway via taxiways so that residents can manoeuvre their planes onto the runway. The layouts of most fly-ins resemble those of suburban settlements. They are however long-distance suburbs, since inhabitants usually have to span great distance between their community and city via airplane.
 Conway, H. McKinley, The Airport City. Development concepts for the 21st century, Atlanta, 1977.
With thanks to Carlos Bravo, who provided information about Spruce Creek.