Yeah, but it is a shame that the rest is closed source. This game could seriously benefit from community contributions and/or from a fork. There is a really strange issue that occurs when the map is far too big; the ground shakes uncontrollably. Given how simplistic the game looks, you'd expect maps to be able to get really big without much of an issue, yet we have bugs like these...

I do remember there being a server plugin of sorts that somehow managed to do things like darken the sky as your aircraft climbed. Can't remember what that was called.