Failed project of mine that didn't see the light of the day. The idea of the project was to create a plugin for temporary fly that was a better alternative to non-working ones. However I didn't really had time at that moment to work on it. Now it exists as a plugin called "TempFly" which have everything you need. https://www.spigotmc.org/resources/tempfly.54987/
So, in other words, I'm no longer maintaining/working on this project.