from collected rulings:
• This does not let a Champion ignore attack restrictions. If you use this ability on a
Deploying Champion, it will gain Airborne but it will not be able to attack. Similarly, this
will not allow a Flipped or Expended Champion to block.
• If this attacks with a human Champion, and the Pegasus is removed from play, the
Human will be unaffected. Try not to picture this.