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Windows store app, implement User-Based Authorization. Offline and online

I am developing windows store app which is intended to work during  flight. Now, i want to implement authentication.  
 What are the best practices for User-Based Authorization in windows store apps?
Note, that there will not be internet access during the flight.
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Distinguished Expert 2019
windows store app uses the users Microsoft account, so the user when logging into their machine provides the credentials there.  Your app only gets a token which gives your app permissions on the client.  While in off-line mode this is as far as you can go.  When the user gets the app from the store their credentials are used.