Hi
Air Control is a lasting, persistent endevour for the players. Currently, the savegame system is handled purely by the clients connecting to a dedicated server. Its a nice little feature or small groups of friends etc. but for other communities, who would like to work together on a campaign that potentially are active during timezones, this system is not possible.
The common practise for a persistent game mode would be to have the save stored locally on the server, sadly, this currently isnt possible but would be great to have.
There are many ways to implement a system like this. Ether a mission parameter that can be set to " for dedicated servers: save on server and load latest savegame from server" once a player connects, would be the most practicle one.