What's the fastest flying vehicle in GTA 5?

I'm curious to know, what exactly is the fastest flying vehicle that can be found in the game Grand Theft Auto V, also known as GTA 5? Is it a jet fighter, a helicopter, or perhaps a unique aircraft that I may not have encountered yet? As a player, I'm always looking to enhance my gameplay experience and knowing the fastest means of transportation can definitely come in handy. So, could you please enlighten me on this matter?