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The Reins of the Onyxian Drake is a flying mount that drops from Onyxia. The Reins can drop in either the 10-player or 25-player version of the instance, and has an extremely low (1% - 2%) drop chance. It also has a chance to be listed on the Black Market Auction House.
Here you can buy The Reins of the Onyxian Drake for EU or US Servers.
You'll get guide for getting The Reins of the Onyxian Drake
You'll be able to get Onyxian Drake
After patch 10.2 might will need character transfer for access to BMAH