CS: Commercial service – nonprimary are publicly owned airports that receive scheduled passenger service and have at least 2,500 passenger boardings each year.
R: Reliever airports are designated by the FAA to relieve congestion at a large commercial service airport and to provide more general aviation access to the overall community.
GA: General aviation airports are the largest single group of airports in the U.S. airport system. They are public-use airports that do not have scheduled service or have scheduled service with less than 2,500 passenger boardings each year.
Enplanements – The number of enplanements (commercial passenger boardings) that occurred at the airport in calendar year 2024, as per FAA recordsreleased October 2025.
See also
Rhode Island World War II Army Airfields
Wikipedia:WikiProject Aviation/Airline destination lists: North America#Rhode Island