The airline needs to have sufficient contact details available to proactively contact the passenger in the event of irregular operations or provide the customer with updated information about their journey. Airlines shall use these contact details exclusively for the purpose of operational notifications and shall not use the contact details for sales or marketing purposes. Operational notifications include but are not limited to changed time of departure, flight delay alert, flight cancellation, pro-active flight-rebooking information, seat change, gate change, baggage updates, check-in open/automated check-in, etc.
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