One of the several ways to get an Air France Upgrade is by using your Flying Blue miles. If you don’t have sufficient miles for a free upgrade, you can also buy an upgrade at check-in or through the Air France official website. Some passengers have reported success with Air France Upgrade offers that are sometimes available before departure. Another method is to rely on your Flying Blue status - Gold and Platinum members tend to have higher chances for complimentary upgrades, especially on long-haul international flights. Keep in mind that upgrades are subject to availability, and they are often given to those with more flexibility in their tickets or those with higher status.