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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Principal airports are airports which serve domestic destinations. There are 40 in total. This category is further subdivided into two types: Class 1 principal airports are airports capable of serving jet aircraft with a capacity of at least 100 seats (but could be 70).
Class II airports are those airports that serve scheduled operations of small air carrier aircraft and unscheduled operations of large air carrier aircraft. Class II airports are not permitted to serve scheduled large air carrier operations.
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.
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.
Larger airports usually have several runways in different directions, so that one can be selected that is most nearly aligned with the wind. Airports with one runway are often constructed to be aligned with the prevailing wind.
Take, for example, Washington D.C., which is served by two local airports. While Washington-Dulles (IAD) is about 25 miles from the National Mall, it is considered a DC-area airport. The other airport, just across the river from the National Mall, is Washington-National (DCA).
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.
Class D airports have an Air Traffic Control Tower to coordinate airport operations. However, unlike Class B and C airports, they don't require a mandatory approach and departure control (though many do have approach/departure).
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.
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.
A 1st Class medical is required when flight operations require an Air Transport Pilot (ATP) certificate. An ATP is required to act as the Pilot in Command (PIC) or Captain of a scheduled airliner. A 2nd Class medical is required when flight operations require a Commercial Pilot certificate.