• Airhealth.org Provides information about Economy Class Syndrome and offers DVT prevention tips for pilots and passengers, treatment information, research, and a review of how well various airlines inform their passengers of the risks of blood clots from air travel.

• DVT.net From Aventis Pharmaceuticals. Information on the causes, symptoms, and treatments of deep vein thrombosis, pulmonary embolism, and stroke.

• Economy Class Syndrome Features description of risks and symptoms, prevention tips, information about compression hosiery, and links to related articles.

• Investigators Against ThromboEmbolism (INATE) Information about the prevention and treatment of venous thromboembolism.

• The Anticoagulation Forum A network of health care professionals committed to the therapy of thromboembolic disorders predominantly through anticoagulation.

• The Whiteley Clinic Information about economy class syndrome and deep vein thrombosis (DVT) including precautions for air travel.

• Thrombosis Interest Group of Canada Detailed information on blood clots. Explanations and treatment options.

• Thrombosis Research Institute A multidisciplinary organization concerned with the interrelated problems of thrombosis and atherosclerosis.

• Travellers Thrombosis From Dr. P. C. Malone, offering research papers, articles, and DVT information.