Who are all the WWE high flyers?

A better list:

Jeff Hardy

Rey Mysterio

Evan Bourne

Matt Hardy

Rob Van Dam

Eddie Guerrero

Jimmy Snuka

Ricky Steamboat

Ultimo Dragon

That's more like it.

Don't forget;

Justin Gabriel

Kofi Kingston

John Morrison

Tyson Kidd

Kaval

Primo

and Carlito

And many consider Chris Jericho and R-Truth to be high flyer's as well.