Currently a multitude of qualifiers, determine what is a confirmed itinerary, which leads to a complex data setup, and making it hard for customers to report and determine data.
In an upcoming release the Confirmed checkbox will be removed along with the Inactive itinerary logic.
The definition of a Confirmed itinerary will be based on the itinerary Status only.
An unconfirmed itinerary will no longer become inactive however sharing will automatically become inactive.