Possible Clues:

• Official document required for foreign travel
• Official document required for international travel
• Let the wine travel in my direction
• Let me have the decanter to get away with it
• It makes it easier for the traveller to let someone have wine
• International identification document
• Seems that Father's fun is to keep the wine moving while travelling
• Dad's good bloke - the key to success?
• Vacationer's ID for leaving the country
• Permit and distribute after-dinner drink