HelpJumpack

My friends on my TTT server are using the Jetpack, or the jumpack. Whatever it is, they said they used the console to use the jetpack to practically fly, I watch them. It usually just lets you have a small boost, to jump about 2 feet higher. They fly! Alot higher, they could float in the air for hours, probably. I've wondered how they do this, but now they're bragging about it. Anyone know what command they put in Console is? Any help would be appreciated!

I'm pretty sure its just part of the servers pointshop.

There are multiple addons to set the gravity for one player, which they are probably using. I use it and can fly really far. :3