how many members in the iaca
quintessence Joins IACA as an Associate Member quintessence Joins IACA as an Associate Member. We are pleased to announce that quintessence is an associate member of the International Air Carrier Association (IACA) since November, 1. With quintessence being the newest entrant, IACA currently represents 33 airline members from 19 countries and 21 associate members. It is the recognised voice of the leisure travel industry worldwide.