As a person who has traveled a lot, I'm not sure if I can really say that. All of my airplane experiences have been thrilling (in a good way) to me. It's very exciting to travel by plane, though it could be a bit boresome if you don't have anything to distract you.
I think the only terrifying thing of it all is the thought that the airplane might crash and everyone dies, or either only you survive and have to make your way back home when you're in the middle of nowhere and have no one to call for help since everyone that was with you on the plane did not have the same fate as you, and you stand in there, looking at all those soulless, empty husks that once had lives, friends, family, but now, were reduced to a pile of bones and a pool of blood. As you witness this horrific scenery, you wonder if you had a better fate than the others, or if you were cursed with the sentiment of guilt, anxiety and the torture of the journey you need to make to get back to your life, before you get consumed by madness and trauma, knowing full well that it could've been you, you could've become a lost soul along with the many others that died, and everyone could've forgotten about you if it weren't from the headline of the news "An airplane crashed… again". Yes, again. Airplane crashes are not that uncommon, after all. Think about all of those crashes, all those lives lost. You could've been only a drop in a sea of dead people, then you remember that, one day, you will be just like that. Death comes for everyone. By surviving, you didn't change where things were going, you just postponed it. There is no escape. It is inevitable.
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Either that or not knowing what the flight attendants will give you to eat, it's a 50/50 chance that they're either gonna serve you something decent or plain garbage.
"Just cheer up/be happy" is terrible advice.