Easy solution, just charge more for a child than for an adult, no fees needed.

Currently children <11yr get a 20-50% discount/subsidy for a seat. So just rectify it to a 100% and give the seat as a bonus instead. Everyone happy?

	▲	brummm 5 hours ago \| parent \| next [-]
		I have never seen this. For all flights I have flown recently, the price for a kid and an adult is the exact same.
	▲	mothballed 5 hours ago \| parent \| prev [-]
		Honestly I would be happy if the 5x the price, and I'm a parent. I hate flying with a kid and it would let me convince the wife to drive or take a boat the next time. I basically only fly with a kid because everyone else is willing to subsidize the massive externality I impose on them.