It's self explanatory, and it's embarrassing. I'm trying to make a flyable mob and want to look at creative flying, but I can't find the creative flying class 

See? Embarrassing.

 

Can anyone tell me where to find it?

Someone already told you were to look in one of your previous post on how to create your flying mount.

There aren't any other flying posts that've been replied to- I took them down when I fixed something

Regardless, you asked from a car you build, on how to make a flying entity. 

 

You were answered to look at flying entities (such as a Blaze) to figure out how to do it.  Its not that hard.  Trickiest part is getting the Trig right to translate move on heading and putting in your own keys for up/down.

When and where was this? and can you please just tell me where I can find the creative flying class?

Look under Player, PlayerMP, ect.  You will find what you think you are asking for, but it won't help you make your flyable mount.