Can I use airplay with Now TV box?

That would be a question for the NOW TV help website.

They would know what it supports.

http://help.nowtv.com/

However, I would think its very unlikely, since AirPlay is Apple's proprietary protocol. And Nothing outside of their products use it.

well there are devices which support the audio part of it

Rudegar wrote:

well there are devices which support the audio part of it

True. Forgot about that.