Cleon
Legend
I just looked up dragon weights in the 3e Draconomicon, since these are supposed to be built like dragons. A Gargantuan dragon is 80 tons, so I'll go along with the 50 ton weight you have.
Updating Skykine Working Draft.
I did figure the levitation ability actually went along with a reduced weight, but it's all magic after all.
I'd already considered that, which is why the proposed entry said its levitation rendered it effectively weightless while its MASS is 50 tons.