Yep ... I'm using Apowermirror -->
ApowerMirror: Screen Mirroring App for PC/iPhone/Android/TV it is compatible with iOS also.
For spectator purposes it works very good ... You have the app in both devices, then turn on hotspot in your flying device & connect up the other towards it ... finalize then the connection from within the app. Shows perhaps a tiniest delay on the spectator device but they will not notice. And this will not require mobile data either, you can turn that off in the hotspot transmitting device if you want, just a in-between connection through hotspot is enough.
Here how I screen mirror from my Tab to my phone ...