While the view from a nice window seat on an airline might be serene and beautiful, it can also be deadly.

According to a report from Carrie Gann of ABC News, sitting in one position for hours at a time can cause the passenger to develop blood clots in the leg. These can then travel in the blood stream to the lungs, where it could cause a pulmonary embolism.

What is even scarier is that a pulmonary embolism has been found to be fatal in up to 30 percent of all cases.

Interestingly, ABC notes that passengers with roomier first class seats are not escaping the risk either. The culprit is actually the lack of movement. Passengers that sit in a window seat are not able to move as much, which makes them more susceptible.
Read more: