Who said it doesn't get cold on flights? I always wear my casual leather jacket (maybe that's why it's called a flight jacket? Come to think of it, it's moreso a bike jacket before you call the fashion police) to fly simply because i'll freeze without it. Along with that: jeans, nothing amazing shoe-wise, and a regular shirt/polo.
What's up with the whole hatred of jeans in comparison to slacks? Yes, I didn't have to press my jeans (and the people who do are freaks) but they're fashionable. More fashionable then pleats *cringes*