The game description is as follows: This game world is the first in AirwaySim to test the concept of ultra-long scenarios. World starts initially at a lower player number and shorter day lengths, but as the time progresses the player number is increased together with the day length.
This means that the settings of this scenario will change over time:
* The max player count will increase at a rate of 1 player more per each game month, until a number of 700 is reached on 1995.
* The game day length will change as follows: 1955 to 1964 - 20 mins / day, 1965 to 1974 - 25 mins / day, 1975 to 1999 - 30 mins / day, 2000 to 2020 - 35 mins / day. (these are preliminary settings and may still change)
* The game interface has been also updated to reflect these settings at the game selection screen for example. (clock / time converter page will be updated later this week to know of these new features)
You can read some more details here: http://www.airwaysim.com/forum/index.php/topic,47874.0.html