Yes, Air France allows travelers to make a seat upgrade after the booking. Moreover, the airline provides several modes to do so. Passengers can request an upgrade by paying for it directly on the official website or at the last minute from the check-in counter at the airport. Further, with Air France Upgrade Flight options, one can avail the benefits such as extra comfort, better dining, and priority services during their journey. To learn more details about the upgrade, contact the customer service of Air France or read the blog at the mentioned link.