Passengers with a high body mass Do you have a high body mass? For your comfort, you will need an additional seat. Please remember to notify us when you make your reservation. Reserve an additional seat... ...and travel in greater comfort! The aisle width on our aircrafts is 43 cm (17 inches). The width of our onboard seats is: 40 to 45 cm (16-17 inches) in the Voyageur and Alizé cabins (which corresponds to a waist measurement of 135 cm or 53 inches), 47 cm (18.5 inches) in Affaires medium-haul business class cabins, (which corresponds to a waist measurement of 149 cm or 59 inches), 48 cm (19 inches) in Premium Voyageur class cabins, (which corresponds to a waist measurement of 149 cm or 59 inches), 50 to 53 cm (20-21 inches) in La Première first class and Affaires long-haul business class cabins, (which corresponds to a waist measurement of 200 cm or 79 inches). If your waist measurement exceeds this, you must reserve an additional seat. Air France will offer you a discount of 25% if you purchase an additional seat. If you are traveling in Affaires business class on a medium-haul flight, for technical reasons, you will not be able to reserve an additional seat. In this case, you are advised to reserve two adjacent seats in the Voyageur cabin. Please note In the interest of safety, if the flight is full and you have not reserved an additional seat, you may not be allowed to board if your build does not permit you to sit comfortably in a single seat.