The My Account area of the app allows you to sign in/out of your NC Software account as needed, although once signed in you should remain signed in as there is no reason to sign out other than if sharing a device with another user. You can view your subscription status for Logbook Pro Mobile and the Airline Schedule Importer and if your app allows in-app purchasing you can renew your subscription directly from this screen. Subscriptions can be renewed at any time as they will extend off of your current expiration ensuring no overlap.
Overview
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