Airport

An airport is an aerodrome with extended facilities, mostly for commercial air transport.[1][2] Airports often have facilities to park and maintain aircraft, and a control tower. An airport consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surface such as a runway for a plane to take off and to land[3] or a helipad,[4] and often includes adjacent utility buildings such as control towers, hangars[5] and terminals. Larger airports may have airport aprons, taxiway bridges, air traffic control centres, passenger facilities such as restaurants and lounges, and emergency services. In some countries, the US in particular, airports also typically have one or more fixed-base operators, serving general aviation.

Sample infrastructure of a typical airport. Larger airports usually contain more runways and terminals.
Airport distribution as of 2008
Passenger Terminal at Kolkata's Netaji Subhas Chandra Bose International Airport
Bangkok Suvarnabhumi Airport
Terminal 3 at Dubai International Airport (DXB)
Solar panels at Cochin International Airport, India, the world's first airport to be fully powered by solar energy.

Operating airports is extremely complicated, with a complex system of aircraft support services, passenger services, and aircraft control services contained within the operation. Thus airports can be major employers, as well as important hubs for tourism and other kinds of transit. Because they are sites of operation for heavy machinery, a number of regulations and safety measures have been implemented in airports, in order to reduce hazards. Additionally, airports have major local environmental impacts, as both large sources of air pollution, noise pollution and other environmental impacts, making them sites that acutely experience the environmental effects of aviation. Airports are also vulnerable infrastructure to extreme weather, climate change caused sea level rise and other disasters.

Commercial jets wait for the "7am hold" to pass before departing from John Wayne Airport in Orange County (Santa Ana), California, on February 14, 2015