You can lose as much as two pounds of body water by evaporation through the skin during even a three-and-a-half-hour flight on a jetliner because of the rapid circulation of very dry air. Dehydration - fluid loss without adequate replenishmet - can sometimes become severe enough to cause dry skin and mucous membranes, cracked lips, lethargy, fatique, and muscle cramps. Short of that, it can contribute to jet lag and underpar feelings. Replenish fluids! Airplane water may be insipid, but drink it. Don't depend on alcohol - or on coffee, tea, or other beverages containing caffeine; all can increase fluid excretion, adding to the loss.
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