Airplanes
The casual server have a airplane mod in it. You are able to do whatever you want with it, fly it anywhere. Do anything, even RP in it. However, you have to remember others may not be roleplaying, nor want to.
No restrictions
In casual, there is no restrictions, no Roleplay rules, aswell as, you cannot be banned from it. It's free to use, no need to be in the discord, nor no need to follow anything anyone says there. However, remember, racism isn't allowed, you should stick with that your whole life.
Active Player base
Even if the roleplay servers aren't active, the casual server would be, they have a constant of 1 or more players playing them at a single time, mostly over 5. Even though they aren't the regulars doesn't mean they won't speak to you. You can make friends anywhere, don't let a word change that.