Board Thread:Speculation, Theories, and Rumors/@comment-25912037-20141223043619/@comment-477304-20150529174329

Nope, he doesn't call it flying in SA either, it's always been known as gliding.

I don't know, how do you explain a blue hedgehog who runs at the speed of sound? Or how Tails is able to use his tails as if they were helicopter blades?

You didn't say anything of the sort, you just said that's downplayed in Sonic games as of late, which is true, but also applies to pretty much every character who isn't Sonic. Additionally, I'm not trying to say that Knuckles isn't powerful. When it comes to the games (physically) he's one of the strongest characters in the series.