Originally Posted by
FlyingBeanCounter
weird. It would be cheaper to book a coach ticket and just take her on my lap in first class.
You can't do that. Too young to fly as an unaccompanied minor and in order to be accompanied, a parent has to be seated in the same class of service. This will work if you are able to downgrade from D1 to Y.
The advice not to let time pass is important. If all that is left is full fare D1, 10% of that can be a fortune.