Chances are they had their security certificate revoked (common issue when an app won't install). If it's working again, they found a new one. 

Uninstalled mine couldn't be bothered.
Are you kidding me? So Much information lost if you can't recorded the screen. When S_it goes a bit wrong you can learn a lot for that data. Then again maybe you just can't be bothered!
I use shou app 100% of flights and still never had an issue. I leave my iPad in permanent airplane mode..
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