Learn your mounts and your vanity pets at your own risk. My server went down and I am now lacking all my non-quest vanity pets, and my flying mount, all of which were learned before the server crash. They are not in my bank, or my bags. They are not in the tab. And they are not at the stable master.
UPDATE: My ticket, which was put in a little after 3:00, has been escalated. And they now have a login message that they are working on the issue. That is comforting.