How to program the Minecraft plugin to create a code where all players can fly on the server?

How to program the Minecraft plugin to create a code where all players can fly on the server?

Can't you also change the game mode by command block for all players?

Yes, but it's dangerous to put a command block on a server like Griefergames, because if a hacker comes up and finds the command block, we're at the end. That's why I want to program a plugin for it.

Okay, that was just the best option that came to mind so spontaneously. Otherwise, look at other plugins use the soetwws about what they do.

Oh Lord. Jz comes to my knowledge about the 7 years in Minecraft.

So. You have an MC server I guess but want all the players to be able to fly on the server. There's a file called server.properties or config.yml or so is by default already there.

Somewhere should be "allow-flight = false" or true. Or fly = blabla

Then set to true. Now every player can fly.

You can also if it is not to be found, it synonymous in the config insert.

You do not have to do anything rude.

Yes, I want to program a PLUGIN with which, for example. / booster fly on power and then fly on the server and if you make / booster fly off it is off