I think that you have a mistake on dates.
You probably mean Aug 21 and 22, not 22 and 23.
AF 772 only has 16 J seats. Apparently most seats are already assigned on those two days, so there is simply a group booking. Could be a "French" group attending a conference in SEA and returning on Aug 21/22 or a "US" group going for a conference on 21/22.