| acriss.org | The Association of Car Rental Industry Systems Standards |
| atta.co.uk | African Travel & Tourism Association |
| atme.org | Association of Travel Marketing Executives |
| arccorp.com | Airlines Reporting Corporation |
| americansightseeing.org | American Sightseeing International |
| acte.org | Association of Corporate Travel Executives |
| aaco.org | Arab Air Carriers Organization |
| adventuretravelbusiness.com | Adventure Travel Society |
| world-tourism.org | World Tourism Organization (wto) |
| fiyto.org | The Federation of International Youth Travel Organisations |
Netherlands , ,