https://www.polygon.com/fortnite-battle-royale-guide/2018/5/22/17380196/fortnite-jetpack-tips

Epic Games has finally added the long-rumored jetpacks to Fortnite with the v4.2 content update. They’re only limited-time items, and they’re kind of a big deal. I jumped online to see what the jetpacks are like in action, and yep, they’re going to change things pretty significantly while they’re around.

The jetpacks are Legendary items found in treasure chests. They’re not going to be all over the place, and you may have to play a few rounds to get one.