Mine are as follows:
Having to walk through stinky perfume shops on the way to the gates.
In the queue for security why do people stand so close behind you? Forever getting bashed or they push in whilst you're trying to sort your stuff into the security trays.
Being called to the gate too early, and then having to sit for AGES and can't get to the toilets.
So humour is with your pet peeves at airports.