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Travelling within EU does not require using a passport by EU citizens - passengers can use national ID cards instead.
It is now possible to add ID card's details to Leon and use it on the trip. Leon will show ID card's details on documents, such as: Crew Trip Sheet, GenDec or PAX Trip Sheet.
When adding a new passenger's profile (or when editing the profile of already added PAX), click on the button and insert ID card's details.