In terms of airports, heliports, and seaplane platforms, there are roughly 14,400 private-use (closed to the public) and 5,000 public-use (open to the public) facilities. The National Plan of Integrated Airport Systems includes about 3,300 of these public-use amenities (NPIAS).
AIP money may be given consideration for airports or portions of airports that are part of the NPIAS. Any area of land or water used or intended for aircraft landing or taking off, including an adjacent area used or intended for airport buildings, facilities, as well as rights of way alongside the buildings and facilities, is referred to as an airport by legislation. If you want more information, then read more here.
A for-profit service publicly held airports that board at least 2,500 passengers annually and offer scheduled passenger service are considered to be airports. Passenger boardings, whether scheduled or not, allude to paid passenger boardings on an aircraft engaged in air commerce. The definition also covers passengers who remain on an aircraft during an international journey that makes a stop at an airport in any of the 50 States for an activity other than passenger activity, such as refuelling or aircraft maintenance. Enplanements are another name for passenger boardings at airports with scheduled passenger transportation.
Commercial service airports :
Airports offering commercial service that embark between 2,500 and 10,000 passengers annually are considered nonprimary commercial service airports.
Commercial service airports that transport more than 10,000 passengers annually are considered primary airports. Hub groups for Primary Airports are calculated as a proportion of all passenger boardings conducted within the United States during the most recent calendar year that ended before the start of the current fiscal year. Since the fiscal year started nine months after the conclusion of the preceding calendar year, data from the calendar year 2014 are used for the fiscal year 2016. The formulas used to define airport categories are shown in the table above based on the statutory provisions mentioned in the table, including Hub Type as defined in 49 USC 47102.
Cargo service airports:
Service for Freight Airports are those that, in addition to any other air transportation services that might be offered, are only used for the air transportation of cargo weighing a total of more than 100 million pounds per year arrived. The weight of an aeroplane that is only flying domestically, internationally, or both is referred to as its “landed weight.” An airport may provide both business and cargo services.
The FAA has designated certain airports as Reliever Airports in order to ease traffic at Commercial Service Airports and enhance general aviation access for the general public. These could be privately or publicly held.
According to 49 USC 47102(8), general aviation airports are public-use airports with no scheduled service or fewer than 2,500 yearly passenger boardings. General aircraft is present at about 88 percent of the airports in the NPIAS.
General aviationservice Airport :
The FAA conducted two top-down reviews of the current network of general aviation sites covered by the NPIAS in collaboration with the aviation community. Two reports (General Aviation Airports: A National Asset) contain the outcomes of these efforts, and the biennial NPIAS has completely incorporated them.
The various functions and economic benefits GA airports make to their communities and the country are captured by the airport roles. Based on current activity levels, five categories for airports supporting general aviation (including non-primary commercial service, relievers, and general aviation) were created. Below is a list of these positions. FAA Order 5090.5 and Annex C of the Current Published NPIAS both list the requirements.