Re: Solution to the problem
can't equalise the pressure in their ears and this can be excruciatingly painful. But there seem to be loads of parents who would rather inflict this pain on their kids than miss out on a sunny holiday.
Going them a bottle* or dummy gets them to suck and that equalises the pressure. It is known. (If it isn't then politely suggest it.)
Also, I take exception to the sunny holiday thing. Families with partners from different countries are a thing.
* If airport security didn't carry out a controlled explosion on it, of course.