India, Dec. 18 -- Flights are notoriously freezing 365 days a year, no matter the season or destination. Frigid air cabins might make sense when you consider the fact that temperatures outside of a flying airplane can dip as low as -92 degrees Fahrenheit-but the truth is, air cabins are kept cold on purpose, not by accident. Plane cabin air systems have built-in heaters, believe it or not, but the inside cabin temp is usually kept cooler than most passengers might prefer. Why make flights unbearably chilly, then?

The answer revolves around keeping you (and your fellow passengers) healthy. For one, warm air can dehydrate you faster than cold air. Dehydration can lead to dizziness, nausea, muscle cramps, and other health woes that are alr...