Google has now updated its official YouTube TV app with support
for AirPlay that lets you play video streamed from your iPhone/iPad on a TV set
via Apple TV.
YouTube TV is currently available to
residents of the following areas: Chicago, Los Angeles, New York City,
Philadelphia & San Francisco Bay Area.
  • Stream from major broadcast and cable
    channels ABC, CBS, FOX, NBC, ESPN, your local sports channels & more.
  • Take your TV with you. Watch recorded and on-demand TV, anywhere you go in the
  • Cloud DVR without DVR storage space limits. Each recording will be stored for
    9 months.
  • Comes with up to 6 YouTube TV accounts per household.
  • Stream on all your screens: phone, tablet, computer, laptop and TV with Google
    Chromecast or Apple AirPlay. 
  • Try 1 month free.
  • $39.99 / month. No commitment, cancel anytime. 
There are a few bug fixes and minor
improvements in this thing, too. But mostly AirPlay. reads the changelog for
YouTube TV on App Store.
You can download YouTube TV from the App
Store for free.