I mean, I like the idea, but there are gonna be a ton of issues not only with that just being weird as heck, you'd also run into issues with evading damage from outlaw attacks, exploitation with building and piloting movecraft, combat evasion, chasing people, and the list goes on. Don't get me wrong, this would be a really useful and fun feature, but there are a lotta issues that should be addressed.

fly would be disabled near sieges or if u enter combat idk bout the movecraft thing

I really like the idea but as ashes said theres alot of stuff you would have to work out

honestly. i think this shouldnt be a thing but there could be a thing like a jetpack which when you press space you go up. it would be an slimefun item made from steel and maby iron golem circuits. it has the fly time of 1 minute and it cannot be used outside of your town and only town members who have the builder role (i remember there wouldv been a builder role you can give but if not then idk) it cannot get used in siegezone nor it cant get used in allied and apart of nation towns. only the town you are in and make it so that it is disabled when you are in combat and has very short durability.

I have to agree with Ashes here. The PvP-oriented nature of Nations means /t fly will inevitably be exploited in ways that are difficult to address.

I like oliversumi's idea. It could work. A jetpack in only peaceful, nation claims.
It could have levels too:
-Jetpack: cheap, but one time use, has 1 minute of flight time, not rechargable

-Fuel Jetpack: more expensive then the normal one, has 3 minute flight time, rechargable with fuel

-Advanced Jetpack: this would be expensive, using nether stars, blistering ingot, and the previous jetpack level. This would have 5 minute flight time, ould have an airlock function, witch means you toggle the jetpack, and you'll float in the same Y level. Rechargable with fuel.

idk if it shouldnt be rechargable. maby if it takes a lot of durability and it can break/overheat. you could like recharge/fix it in a slimefun anvil.

The duration of the Jetpacks can be lowered if it seems too op
If this is getting implemented, i can help with the sf recipes
Discord: csipok