One thing I learned in my early twenties while traveling a lot is that no matter where you are going, air planes are typically going to be cold. There are more than 2 reasons to keep the temperature of the cabin of an aircraft low, but some people are not used to being that cold. A lot of people who travel frequently know that the AC on the plane is typically set to a really low temperature as well as it can be hard to remain moderate on the plane, periodically, I even bring a jacket as well as a blanket with me when I travel, and depending on the endpoint as well as duration of the flight, I typically make sure to bring the right kind of clothing depending on where I am going as well as whether or not the place I am staying has usual heating as well as cooling. Periodically, when you get to a place you haven’t been before, you might find that the a/c isn’t what you’re used to back home. Also, the heating situation might not be as moderate as you are used to. It is better to be prepared when it comes to traveling as well as packing the right clothing. One time, I went on a trip to a really humid place as well as found myself sleeping in a cabin with no a/c. This really interrupted my sleep as well as made the first few afternoons of the trip less great than it would have been if I would have assured that the cabin was equipped with a usual cooling system.