Some countries, including the United Kingdom, are considering legislation that would require airlines to notify passengers of the risks associated with long-haul flights. The so-called economy class syndrome is believed to have killed hundreds, even thousands of travelers over the years. When people sit for extended periods of time, as they do on long flights, the risk of developing a blood clot in the leg increases. These clots can move into certain vital organs, such as the lungs, where they often result in sudden death. The British law, proposed by John Smith, would require airlines to inform passengers of the risk and instruct them on how it may be prevented.

Many feel that a change in the law will have only a minimal effect. "I think politicians interest in the topic is welcome, but I think litigation is going to do more," said John Belstead, accident and emergency consultant at Ashford Hospital near Heathrow airport in London. The hospital sees at least ten deaths each year attributable to economy class syndrome. However, John Smith, the politician supporting the legislation, believes regulation is nevertheless necessary. "It is time for legislation, you can't sit back and wait for voluntary action. I have strong cross party support for this bill. It is an issue which could affect anyone. Sadly, there is some evidence that not all companies are doing all they can to assist the various studies that are being carried out into [economy class syndrome]. If, as has been suggested by some that air travel could be a major cause of up to 20 percent of cases, this is a public health scandal. This is a matter of public concern. How do you avoid more risks like asbestosis and mad cow disease? You do it by fully informing the public. There is evidence building up and the airlines do need to co-operate. If it is possible that it is a major hazard then we need to know what steps we can take. And I don't understand how there can be any reluctance to that," he said.