Airway Renegade

Airships you control get +1/+1.
Whenever an airship enters the battlefield under your control you may pay {w/u}. If you do, it gains hexproof until end of turn.
"Fly me to the skies!
Let me skim across the clouds!
Let me see what currents are like
In the upper atmosphere!
In other words, cut me some slack!
In other words, I'll be back!"