FlyCommand

Installed on a server, FlyCommand gives players the ability to fly. The mod addresses several problems where a player loses flight status or information about the flight when the game mode changes or the world is left and joined again. Player data is written to a playerdata file named after the player UUID inside the save, so the state is kept after the server world is closed. Switching the flight command on changes the game mode, and a player who lands after leaving flight in Survival or Adventure mode gains immunity to fall damage.

Once FlyCommand is present, the server keeps the mining rate of a flying player in step with its own calculation. Without it, only blocks that break instantly are processed correctly on the server, and mining speed is otherwise still calculated on the client, which is slower. The mod is a server-side mod built for Fabric, with files for Minecraft 1.20.1 only. The code and issue tracker are public, and the source is released under CC0 1.0 Universal, so the work is open source and nobody needs permission to reuse it. Fabric API is not listed as a requirement on the current file, so the mod is used on its own.

Several other mods cover flight or travel, and they differ in environment and version range. Dangerous Elytras is server-side only on Fabric, open source under the GNU General Public License v3.0 or later, and built for 1.20.1 – 1.20.6. Flight Mod is open source under the MIT License, is client or server optional, and covers 1.20.6 – 1.21 on Fabric.