Gryphons have always aided the Alliance in times of need, and more importantly the Wildhammer dwarves.
These proud creatures stand as noble symbols of the Alliance's fortitude. In addition to conveying important documents between the Human, Dwarven, and Gnomish leaders in the regions surrounding Stormwind and Ironforge, the gryphons have also been harnessed for paid transportation along routes throughout Alliance controlled territories.
In order to travel by gryphon, you must first speak to a Gryphon Master at the destination point. Upon doing so, the location will be added to your list of known Flight Paths. Each gryphon ride costs a varying amount of coin.
In World of Warcraft: The Burning Crusade, Armored Gryphons are the epic flying mount of choice for the Alliance in Outland. In World of Warcraft: Cataclysm, they will also be available for the Alliance in the planet of Azeroth
Gryphons have a long history of participation in Alliance military maneuvers. In The Burning Crusade expansion, players can participate in bombing quests atop an armored gryphon provided to them for that purpose. [Source: Wowwiki]
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