Download Link: https://www.gta5-mods.com/scripts/nice-fly/download
How to install: Install Script Hook by Alexander Blade then drag the "Nice Fly.asi" and "nicefly_config.ini" files to the main GTA V directory.
Controls: -Press H - to enable/disable. -Hold LSHIFT to boost.
How to Fly: -Jump high and hold S to gain altitute. (W goes down as always)