I have found just the opposite. Over the past few years, regardless of the season, SWA flights have been entirely too warm. If you are flying, please bring a sweater or jacket. It is much easier for one who is cold to put on another layer than for one who is too warm to take their skin off. I’ve flown professionally for most of my USAF career, and am constantly amazed by the number of passengers who dress for a flight as casually as if they are going to visit in their living room. While flying is much safer than traveling by car there is still the possibility of being required to exit the aircraft under emergency conditions into the elements (i.e. sturdy shoes and somewhat protected from the weather).
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