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Airline Empires has been continuously developed and modified since 2004. This section describes the game worlds playable in Airline Empires.

There are typically three kinds of game worlds running at any time: Open, Realistic, and Special. These worlds are accessible once logged in to your forum account.[http://www.airlineempires.org/index.php?app=ae]

'''Open Worlds'''
* Open worlds are defined by worlds that start with the letter 'O' (e.g., O1, O2, O3).
* There are no restrictions or political boundaries limiting where an airline can fly--i.e., airlines can fly any city-pair in the world as well as open a hub and build terminals at any airport in the world.
* Each airline can lease up to 40% of all gates at an airport, or 75% if it's a hub.

'''Realistic Worlds'''
* Realistic worlds are defined by worlds that start with the letter 'R' (e.g., R1, R2, R3).
* Airlines can only open hubs and terminals in the country they start operations in; airlines that start operations in an European Union nation can build terminals at any airport located within the European Union.
* Airlines cannot operate routes in which the departure and arrival airport is outside their home country; this restriction is lifted for those that operate in an European Union nation after the round has reach the year 2000.
* Airlines may further be restricted to flying to certain countries due to political restrictions. ([[List of all political restrictions]])
* Each airline is limited to leasing 10 gates at an airport (or 25 if it's a hub). Further expansion requires building a terminal.

'''Special/Theme World'''
* Special/theme worlds are defined by worlds that start with the letter 'S' (e.g., S1, S2, S3).
* Special/theme worlds operate with a special restriction such as a hub limit, using propeller planes only, high employee salaries, etc.
* For additional information about special/theme world currently in progress, consult the Announcements forum. [http://www.airline-empires.com/index.php?/forum/6-announcements/]

== Legacy (Unsupported) Worlds ==
These worlds are still open to cater to players who enjoy the old style of gameplay.

* '''SIM3 (AE Classic)''' [http://aeclassic.simulationcloud.net/login.html]
**This game is based on the second version of Airline Empires. Compared to the current worlds listed above, SIM3 is relatively simple: there is no first or business class service, no aircraft leasing, and no historical chronological progression (years are numbered from 1 to 10). SIM3 contains modern aircraft and intense competition. Each round lasts 10 years, and competition is generally heavy.
**SIM3 does not support single sign-on using one's forum account. Players need to create a separate account in the game in order to play.
[[Image:Sim3_routes.png|thumb|200px|right|Routes list in SIM3]]

* '''SIM1 (AE Original)''' [http://sim.airlineempires.net/login.html]
**This is the original, first version of Airline Empires.
**SIM1 generally covers an earlier time period (between 1946 and the 70's).
[[Image:Sim1_rankings.png|thumb|200px|right|Rankings page in SIM1]]

[[File:Continuebutton.png|link=http://wiki.airline-empires.com/index.php?title=Starting_an_airline|center]]

[[Category: AE3.1_Help]]