What is a class 4 airport?

Class IV airports are those airports that serve only unscheduled operations of large air carrier aircraft. Air carrier operations are so infrequent at these airports that in the past, FAA only required them to comply with some Part 139 requirements.



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Class I Airport - an airport certificated to serve scheduled operations of large air carrier aircraft that can also serve unscheduled passenger operations of large air carrier aircraft and/or scheduled operations of small air carrier aircraft.

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When the number of flights increases to a level that creates regular and significant flight delays, and infrastructure improvements to manage the capacity are not feasible in the near future, the airport may be declared a Level 3 airport by the FAA.

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At Level 4, the procedure is to reconcile the bag with the respective passenger before the bag is opened, to undertake a further security check.

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In the U.S., the Level 2 airports include Chicago O'Hare International Airport (ORD), Los Angeles International Airport (LAX), Newark Liberty International Airport (EWR) (Change of Newark Liberty International Airport Designation, 81 FR 19861 (Oct. 20, 2016)) and San Francisco International Airport (SFO).

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Because Kennedy, LaGuardia, and Newark are so close, the Class B airspace for the three airports overlaps. Class B airspace is often described as an upside-down wedding cake (see accompanying picture). The top of the airspace is 7,000 feet above sea level for New York's Class B.

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There are two categories of airspace or airspace areas: Regulatory (Class A, B, C, D, and E airspace areas, restricted and prohibited areas). Nonregulatory (military operations areas [MOA], warning areas, alert areas, controlled firing areas [CFA], and national security areas [NSA]).

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Flight operations may be conducted under IFR or VFR, and ATC separation will be provided to aircraft operating under IFR, so long as it's practical. Class F airspace is not, however, used in the United States.

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IATA codes starting with the letter F Listed are cities with an international, regional, or municipal airport and some cities with an airport for only General Aviation (GA), which are usually not served by commercial airlines.

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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.

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12 Different Types Of Airports Explained
  • Primary Commercial Service Airport. JFK International Airport, New York City. ...
  • Non-Primary Commercial Service Airports. ...
  • Reliever Airports. ...
  • Cargo Service Airports. ...
  • General Aviation Airports. ...
  • National Airports. ...
  • Regional Airports. ...
  • Local Airports.


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Class C airspace areas are designed to improve aviation safety by reducing the risk of mid-air collisions in the terminal area and enhance the management of air traffic operations therein. Aircraft operating in these airspace areas are subject to certain operating rules and equipment requirements.

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The airspace around the busiest US airports is classified as ICAO Class B, and the primary airport (one or more) for which this airspace is designated is called Class B airport. As of January 2023, there are 37 Class B airports in the United States.

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ICAO classifies them using a letter system: Class A aircraft are small piston powered aircraft. Class B aircraft are small-medium sized turboprop powered aircraft.

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Pilots who touch down at Furnace Creek Airport (L06) will earn bragging rights for making the lowest possible landing in the United States. At 210 feet below mean sea level, that'll put a twist in your altimeter. Plus, it's not only America's lowest airport, it's also the hottest and driest.

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The rather unique honor of hosting the smaller airport in the US goes to Montana. According to the Federal Aviation Administration, the Dawson Community Airport is the smallest in America. It covers a mere 413 acres and is at an elevation of 2,458 feet, and is five miles northwest of Glendive in Dawson County.

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