AJBS is the "Amicale Jean Baptise Salis". "Amicale" doesn't really have an English equivalent, but I suppose the Jean Baptise Salis Society is close. Based at La Ferté Alais airfield about an hour's drive south of Paris, AJBS is the center of vintage aviation in France. England has Old Warden, The USA has Old Rinebeck & Brodhead, but in France La Ferté Alais is the place to go. Three generations of the Salis family have operated vintage aircraft at La Ferte since 1919.
http://www.ajbs.fr/
https://www.youtube.com/watch?v=5Z3omUUCEDk
https://www.youtube.com/watch?v=YccxtzvPTQ0