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

== Current Worlds ==
Each world lasts for 20 game years and is limited to 200 airlines. Each player may run as many airlines as they wish.
These worlds are accessible once logged in to your forum account.[http://www.airlineempires.org/index.php?app=ae]

* '''Open Worlds: AE1 (2000-2020, 45 min/day) and AE3 (1990-2010, 30min/day)'''
**In this world, there are no restrictions or political boundaries limiting where an airline can fly. Expansion is generally quicker, and airlines can fly any city pair 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: AE2 (1985-2000, 60min/day), AE4 (1995-2015, 30min/day), and AE6 (1995-2015, 30min/day)'''
**These realistic worlds contain more rules governing flights. Airlines are not allowed to fly between two points both outside of its home country.
** Each airline is limited to leasing 5 gates at an airport (or 15 if it's a hub). Further expansion requires building a terminal.
**For example, consider three countries: A, B, and C. An airline based in Country A can fly between A and B or A and C but not between B and C.

== 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]]