One of the things I hate about flying is the discomfort and awkwardness of sitting very close to a stranger for 4 or more hours (the typical length of one of my flights).
I'm an introvert, but I'm not anti-social. I like talking, but I hate small talk … which is what plane conversations often are. (For me, at least)
It's my luck to always get stuck next to: the creepy, flirty man, the smoker or perfume over-doser who gives me a headache, chatty Cathy who ignores the book in my lap, and many others who have left me with the opinion that I'd rather sit alone.