You can share a free one-flight activation for real-time alerts/automatic online check-in with your friend, and you'll get that activation too! Important: It must be one of your friends who don't yet have the app.
Below, you will find step-by-step instructions on how to get a free one-flight activation for both of you:
Go to your Profile → Click on Settings in the upper right corner.
Then scroll down to the "Subscription" widget and click on the "Free Notifications" button:
Now you can choose a convenient way to share it with your friends.
Go to your Profile → Click on the Settings icon in the upper right corner.
Then scroll down and click on the "Earn activations" option:
Click "Share" and select your preferred method to share with a friend: