I generally love everything about flying but the things I hate:
Captain telling you about something important on the speaker like the refulling time when you can't hear him past engine noise and then you find out it was only 40 mins stop not 2 hrs like they originally said and the plane is waiting for you. It happened to me= not fun.
I always take the window seat and then people that get grumpy when you ask them to move once in the whole flight so you can go to the bathroom. If you take the aisle be prepared to move occasionally.
When the entertainment system breaks down.
When you get on the plane and realise you are going to spend the next 15 hours on the crappiest piece of metal the airline has not a big shiny new one.
When you get stuck next to a narccasistic passenger that will not shut up. I once had a girl sitting next to me called Paris and boy did she fit the stereotype. When she started out with " I just finished a year nannying in france and I don't like kids but I thought it would be like the sound of music" then you know you are in for a looooooong ride.
One time I was on a plane from London to Sydney which takes 23hrs. When we landed I was getting down my luggage and got down the walking stick of a 90 something year old man for him. Anyway this guy behind me goes ina really rude, sarcastic tone "can I get past now" I felt like saying you have just spent 23hrs on a plane and you can't wait for me to get down an old mans walking stick. We all know what the lines are like to get off the plane so he got about 1 foot ahead.
Here is a nice story though, once I had a really flamboyantly gay flight attendant and he asked me to put down my window because it was about to get bright out. So I quickly turn around and put it down to look up and he is walking away blowing kisses at me
