My Airplay icon went missing from both my iPhone and iPad. Luckily it's an easy, but weird fix to get it back. You need to change your phone language from English -> French (or any other language) -> English. To do this:
- Select "Francais" and click done. iPad/iPhone/iPod will change over to new language.
- Repeat steps one and two but change device back to English.
- Click "edit"
- Delete the non-English keyboard
Now go try to play media. Your Airplay icon will be back!