The script adds a Jetpack from the GTA Online DLC "The Doomsday Heist" with a mini easter egg on how to open the Jetpack. After opening Jetpacku27a, it will automatically spawn on Mount Chiliad and Fort Zancudo. You can customize your Jetpack.
Installation:
Drop the JetpackSP.dll and JetpackSP.ini files into the scripts folder in the GTA V directory. In order for the script to work, you need to have the latest version of ScriptHookV, ScriptHookVDotNet and NativeUI. Be sure to watch the video in the description on how and where to get the Jetpack.