The Sportsnet app does allow you to stream your SN NOW Live streams via AirPlay.
You must however use the Airplay controls within the video player, and not using Screen mirroring enabled from the iOS Command Center.
Sportsnet Now gives you 24/7 access to livestream your favourite sports in HD on any screen. Choose a plan that is right for you. This product is only available in Canada.
*Sportsnet NOW owns the regional rights to the Oilers, Canucks, Flames and Leafs. In order to avoid being blacked out from those teams' regional games on SN NOW STANDARD, you must reside within that team's broadcast region. For more information on blackouts, visit www.snnow.ca/support.
**All Sportsnet exclusive games are available blackout-free on SN NOW PREMIUM. If a game is on more than one network, the game is subject to regional blackouts. SN NOW PREMIUM also includes NHL LIVE, which lifts blackouts on all out-of-market games.