You can upgrade your Flight Master's Whistle by doing various activities in Legion and Battle for Azeroth. To complete the Battle for Azeroth quest you will have to unlock three footholds as part of the Horde or Alliance War Campaigns, and get Friendly with the factions of Zandalar ( Zandalari Empire, Talanji's Expedition, Voldunai) or the factions of Kul Tiras ( Proudmoore Admiralty, Storm's Wake, Order of Embers). To complete the Legion quest you will have to get Friendly with The Nightfallen, Court of Farondis, Highmountain Tribe, Dreamweavers and Valarjar. Uniting Kul Tiras - Battle for Azeroth quest for Alliance.Uniting Zandalar - Battle for Azeroth quest for Horde.Uniting the Isles - Legion quest for both Horde and Alliance.To get Flight Master's Whistle you have to complete one of the following quests: In this guide we'll go over how to get the Flight Master's Whistle and how to upgrade it by unlocking all possible zones in which you can use it. Flight Master's Whistle is an unique item that teleports you to the nearest flight master on a 5 minute cooldown.

Wow legion flying in broken isles