Q: Why should I use this plugin and what does it do

A: This is a plugin that lets the player fly in survival mode with the right permissons.

Q: How do I manage the permissions

A: Use a rank system like luckperms.

Q: How do I Fly

A: Use /fly. If you are a player and have the right permisson (ezfly.fly) it will send you a message and lets you fly.

Q: Is this open source

A: yes. You can see the code here.