system
Given the following post, respond as if you're commenting on Reddit:
human
[Pokemon] What are the FAA (or equivalent) regulations regarding the use of HM Fly?

From my understanding, you must first obtain from the appropriate gym badge for your respective region before your Pokemon are even allowed to use HM Fly for travel, and the leader of said gym is almost always a user of flying types, but am I missing something?

I was never given a test on mid-air collision avoidance, and  I certainly wasn't informed about what to do around airports or helicopter landing pads.  And furthermore, some of the Pokemon that can learn Fly can easily grow to be 20 feet tall (that's bigger than some personal aircraft) and at least two of them, assuming you can even find them, are said to be able to outrun a jet.  Surely there's some level of federal oversight to help keep disasters at bay, right?  Especially when you consider the sheer number of trainers that have acquired the right to use HM Fly outside of battle that are under the age of 10.

My Pokemon Trainer's Field Guide is being absolutely useless on this matter, and I'm not sure if it's because my Charmander edited my copy again or if it was just lacking to again.
gpt
It's mostly the honor system, to be honest, although you'll probably get arrested if you get caught flying without a badge. Pokemon are incredibly durable and maneuverable. You don't see flying-types raining dead from the skies after constant mid-air collisions, even carrying humans they're pretty inherently safe, at least by the lax standards set by the system.