The people participating in this forum are regular flyers who take an interest in more than just the light. We are interested in the aircraft, check-in procedures........ ( try telling friends its not geeky)
But looking at it from a different point of view. A woman has a 2 yr old and a responsible 14 yr old in the care of their grandparents in Queentown. The grandparents will safely see them to the airport, and it is a 50 min flight. She will pick them up at Christchurch. Neither airport is big and there is no chance of not finding the correct gate.
She books the tickets on qantas website. There are no obvious indications that it is against the law or against Q policy.
If she had booked kids on the bus ( a 7 hour trip ) would it be legal, would they have been refused passage and would there be media attention?
From Q view, it may be illegal to have person under 15 ( or 16?) accompany toddler on flight. I am not sure of civil avialtion law on this
As mentioned by NM, if flight is diverted can the 14 yr old adequately cope. The alternate news headlines " Qantas Lose Baby after flight diversion" is not a good look.
I can only hope that publicity helps prevent this situation for others and that Q will amend its online booking system to make it very obvious where conflict situations may arise