An airport is a designated location for aircraft to take off and land. While smaller airports - more often called aerodromes, airfields or landing strips - might include short dirt or grassed runways, larger airports available for international flights normally feature paved strips, perhaps one or several kilometres long, together with a large complex of buildings where air traffic is controlled, and passengers can embark on planes, or cargo can be stored. Customs facilities often distinguish an airport from an airfield and require a more conspicuous level of physical security.
The traffic generated by airports both in the air and on the surface can be a major source of aviation noise and air pollution which may, in extreme cases, be harmful to health or interrupt sleep. The construction of new airports, or additional runways to existing airports, is often resisted by local residents because of the destruction it causes to the countryside, historical sites, local flora and fauna etc.