IPAD Airplay default output

Hi,

I'm using my ipad air 1 to play music on my speakers through airplay (via an airport express conneted to my Hifi system)

Everything works fine, except one thing, which makes is less pleasant to use on a daily basis

I would like the ipad to ALWAYS choose this airplay receiver as default audio output each time it plays music (It disconnects itself approx 5 mintues after I cut the music). Since the ipad is always used to that purpose, it is very annoying to always have to reselect the airplay output each time I open Podcast or Music app.

It should surely be something simple to implement. I know that apple Tv have this option.

Does someone know a solution ? (including 3rd party apps maybe)

thanks

Pierre