30 Airport codes

The city is given, if it is a city that uses more than one large airport like New York City the name of the airport is also given. If it is a city that could be confused with the city in another state then the state is specified, like Columbus,Ohio could be confused with the one in Georgia which has a commercial service airport. San Juan is included because Puerto Rico is a US territory and are US citizens, and people from the 50 states can travel there without a passport. This makes it a domestic airport.