As a typical 'nervous flyer', I often find myself asking crew about a noise that they say is completely normal during flights. The thing is, I've flown a lot and still hear new sounds sometimes!
For example on a recent Easyjet Airbus flight, when the aircraft went into full throttle to take off, a loud whirring/buzzing sound started and lasted the whole flight (I was sat on the wing)... still no idea what that was.
So what is a general list of sounds that are to be expected vs a list that tells you that you are all but doomed :/
Let's keep this to an Airbus Easyjet might use to keep it a short(er) list.