1) Some airports make you take out your iPad and some don't
2) the liquid ban is ridiculous
3) people who dither about trying to put cases in overhead lockers down the over end of the plane
4) people who take photos out of the window. There is never any need to do this more than once in your life.
5) When the plane is boiling hot when you get on it and then freezing cold
6) People who press the call button by mistake.
7)Airport prices
8) British airports charging for Wi-fi, or offering 30 mins free if you can be arsed to fill in the form.
9) general facilities of UK airports are dirty/usually out of order and vending machines do not work.
10) lack of drinking fountains.
11) screaming children
12) 2000 people arriving at the same time and having 2 people on the border control desk.
13) your mum
14) the TSA
This is not an official entry to the list. but at Gatwick in the 'Duty Free' shop the cigarettes are kept in a secret area with it's own door like a sex shop. Is this sort of censorship really required? The rest of the shop is full of booze and that is fine to be displayed.
I will add more later.