Don't crucify me, but I get annoyed at kids running down the aisles while hitting my elbow as they run (that is if I do get the aisle seat), and well the food isn't too pleasing
I can do without the popping in my ears. Also because of previous injuries from sports, I hate long flights due to the atmospheric pressure. I hate sitting next to someone that has bad manners, you fill in the blanks with the manners.