The three major tour operator associations in the U.S. are the National Tour Association (NTA), the United States Tour Operators Association (USTOA), and the American Bus Association (ABA). In Europe, there are the European Tour Operators Association (ETOA), and in the UK, the ABTA – The Travel Association and the Association of Independent Tour Operators (AITO). The primary association for receptive North American inbound tour operators is the International Inbound Travel Association.
