The Twisting Nether
Kil'jaeden's unnamed Legion ship flies through The Twisting Nether on the way to Argus. He is fought at the stern, on a chain-suspended platform above the thrusters.
The Legionfall forces escape to Azsuna with the [Sargerite Keystone] (on the Olivian Veil mountaintop where Tehd & Marius summoned Brogozog).
The ship later crashes on Argus in Krokuun, at the Deceiver's Scar right next to the Xenedar.
Full view of the ship
The ship's front
This was the best plan