Ever since minecraft commands became a big thing, people have been working on figuring out how to implement flying into survival mode. I found a really cool way to do this, and figured id share it with the PMC community.

First, place down 3 command blocks and set them to repeat and always active.

Then, paste these 2 commands into them
- kill @e[tag=boat]
- execute at @a run summon boat ~ ~-.7 ~ {Tags:["boat"]}

Hold the space bar to go up, and do nothing to go down.