Okay, I went around trying to find out a way to get on the sewers outside of the bank, and I did.
Note: There are a lot of screenshots and it may take several tries for you to get on.
edit: I also searched "Dalaran Sewer Well Mount" and "Dalaran Well Fly" and did not notice any like this, if I overlooked one, I apologize.
Start here:
Move up and turn to your right and enter the portal to the "Purple Parlor."
Hop on your flying mount!
Fly straight down onto the green grass and then turn to your left until you see this..
Almost there! Now fly over to where you can see the sewer well.
Fly as fast as you can straight to the well, you don't have to land on it, you can float above it a bit too. Don't go too low unless you want to fall into the sewers! (If you do, see thread http://www.mmowned.com/forums/wow-ex...sted-pics.html)
Have fun showing off your mount or bragging to your friends. :wave: