This mod will allow you to fly while in a boat and move much quicker in one, but make sure not to use it on any servers like Hypixel, since you will be banned instantly. The default button to toggle the boat flight feature is B, and the default button to increase boat speed is I, and the default button to decrease is O, but it can be changed in the keybinds menu. Messages will appear according to your speed every time you change it. The default boat speed is 8 blocks per second. This is a reference for when the boat is in the water; the speed uses the same values while flying, but the true speed is slightly different.

If you have any questions or suggestions, please leave them in the comments.

If you want to increase your speed with a command, now you can. Use /boatspeed <value> to set your speed manually. Still, even with this command, don't try to go too high. Currently, this feature is only for 1.20.4 - the 4.1.0+ version - but if you need it for an earlier version, let me know at the website or in the comment section!

Any version under 5.0.0 uses the old multiplier system, which is hard to understand, but versions 5.0.0 allow you to choose the speed of the boat in Blocks per second(velocity)

GitHub repository - https://github.com/EricGilerson/BoatFly

This mod is available for all versions 1.17-26.1, click VIEW ALL on the files page to see every version

Here is a video showing how these features work

Boat Fly