Advanced tourism building.
- Allows airlifting to other cities with Airports.
- Increases air unit capacity of the city from 6 to 10.
- 50% from Culture of Wonders and improvements in the city added to its Tourism output.
- +50% Tourism output of Great Works in the city.
The Airport is a great strategic addition to the late game. First, it is a must for nations that pursue a cultural victory, thanks to the additional Tourism output it provides. But even more importantly, it allows airlifting, a new action which is essentially the instant movement of units between cities with Airports. It doesn't matter where these cities are; they can be on two opposite sides of the map! Airlifting represents in a wonderful way the ultimate stage of modern transport, which was until now somewhat lacking in the game - citizen air travel enhances Tourism, while military travel allows you to transport your entire army in a blink!
- Airlifting rules: Airlifting requires the entire movement of a Land unit, meaning that you can't activate it if a unit has already used some MPs that turn. You need to move it within range of the city with the Airport (meaning the city tile or any adjacent tile), then you can use Airlift the next turn. Or you can use it instantly, if the unit was already in range. Note that Airlifting also uses up the whole movement of the unit - it will arrive at the destination city, but you can only move it further the next turn.
- Allowed targets: Airlifting can target the above-mentioned tiles in the destination city (city tile and adjacent tiles), but only land tiles and only if they are free (don't contain another land unit). Although this isn't obvious, the rule essentially puts a limit on the number of units you can transport in a single turn from and to any single Airport - you can't transport more units than there are tiles around a city, for example. The limits are more severe in the case of cities bordering one or more water or mountain tiles, which can't be used in Airlifting.
Technically, an "airport" is any sort of location where airplanes, helicopters, blimps or other aircraft can take off and land. However, in current, common usage an airport is a complex for commercial passenger aircraft, consisting of runways, control towers, hangers, terminals, emergency facilities and even parking structures. Prior to 1930, most airports were small airfields or aerodromes, with runways of less than 600 meters (2000 feet). In 1939 La Guardia in New York City handled nearly a quarter million passengers a month; the most recent statistics for airport passenger traffic list Hartsfield-Jackson in Atlanta as the world's busiest, with over 92 million passing through it in 2011.