- I cannot find my Flight Master's Whistle
- I accidentally deleted my Flight Master's Whistle
Archmage Khadgar in the Violet Citadel in the Legion version of Dalaran can replace your Flight Master's Whistle if you delete it. If you have completed the quest Uniting the Isles and Khadgar does not have the dialogue option to replace the whistle, the item is in your bank or bags.
In Battle for Azeroth you can get a new whistle from Halford Wyrmbane or Nathanos Blightcaller.