Vehicles owned and built by members are mostly hot air balloons but also include hot air airships, gas balloons and gas airships.
Every person fitting the above description is automatically a member.
This means that many member aeronauts don't know about their membership. One can also be an associate member by being in contact with Brian Boland. The whole association is formed around Brian Boland and the Post Mills Airport. For three days, dozens of experimental balloonists and airshippers come together to fly their new creations. Builders and pilots share ideas, experiences and knowledge which makes the event a learning experience for all attending.