FAA airport categories
AMERICAN AVIATION CATEGORIZATION SYSTEM
Nonhub primary airport; Large hub primary airport; Medium hub primary airport; Small hub primary airport; Commercial service airport; Nonprimary airport; Primary airport
The United States Federal Aviation Administration (FAA) has a system for categorizing public-use airports (along with heliports and other aviation bases) that is primarily based on the level of commercial passenger traffic through each facility. It is used to determine whether an airport is eligible for funding through the federal government's Airport Improvement Program (AIP).