Airports vary in size. The large ones used by the airlines are called air carrier airports, and the smaller facilities that serve private planes are known as general aviation airports.
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An airport may be both a commercial service and a cargo service airport.
It is customary to classify the several components of an airport in three major catego- ries: airside facilities; landside facilities; and the terminal building, which serves as the interchange between the two' (see fig. 7).
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.
DCA and LGA are Level 3 airports with primarily domestic or pre-cleared international operations. Allocations are on a continuing basis based on historic slots, a two-month minimum usage requirement, and other provisions in the FAA order and rules.
An IATA airport code, also known as an IATA location identifier, IATA station code, or simply a location identifier, is a three-letter geocode designating many airports and metropolitan areas around the world, defined by the International Air Transport Association (IATA).
Level 1 airports have sufficient capacity to meet demand. Level 2 airports may have some periods when demand approaches one or more capacity limits, but a voluntary schedule-facilitation process prevents systemic delays.
One of the simplest ways an airport gets its code is based on the actual name of the airport. For example, John F. Kennedy International Airport in New York, New York has the code “JFK” while Bradley International Airport in Windsor Locks, Connecticut has the code “BDL.”