If Air France cancels a flight, customers are entitled to a full refund regardless of the fare type. If a customer misses their flight, they may not be eligible for a refund unless they have purchased a refundable ticket or have a valid reason, such as a medical emergency. It is essential to note that the refund policy of Air France is subject to change, and customers should check the most up-to-date information on their website or contact their customer service team for any changes.