When can Druids learn flying?

How to get flying in Burning Crusade Classic

Riding, Project Ascension Wiki

How to Unlock Flying in Burning Crusade Classic--Flying Mount Cost

Wrath of the Lich King Classic Flying - All You Need To Know

Some people are saying that Artisan Riding (ie. Epic Flying) isn't cheaper in WotLK but they're forgetting reputation discounts. : r/classicwow

From where to buy Epic Flying Mount (HORDE), WoW TBC

Flying Machine Control, WoWWiki

How to get flying in Wrath of the Lich King Classic

Turbo-Charged Flying Machine Mount Details and How to get it. - Dungeon Guide

Burning Crusade Classic mount cost and level requirements