Air travel enables passengers to traverse long distances to almost any destination in the world within a matter of hours. However, despite the convenience and excitement of flying, long-haul flights can take a considerable physical （26） on passengers. Research has shown that passengers may lose 1.6 to 2 liters of body water during a 10-hour flight, equivalent to about eight percent of total body water. Such dehydration can result in dry eyes, nasal discomfort, and fatigue. For individuals who are more sensitive to dehydration, these symptoms may become even more （27） . One primary reason for in-flight dehydration is the low humidity level. While people typically find humidity levels between 30 and 60 percent most comfortable, humidity levels in commercial airplane cabins can drop to as low as 10 to 15 percent （28） continuous circulation and high-altitude pressurization. This makes the cabin significantly drier than the Sahara Desert. Anyone who spends a prolonged period of time （29） to such a low-humidity environment will experience greater moisture loss from the body. When an airplane ascends to cruising altitude, the body needs to work harder to absorb oxygen, leading to an increased respiration rate. This higher breathing rate further （30） the loss of body moisture.