My wife may soon have to travel from Australia to Japan solo with our child, probably on Qantas or JAL. She has a Japanese passport in her own last name, our son has an Australian one with mine. We're resident in Australia and happily married, no custody disputes or other unpleasantness.
I know that some countries/airlines require notarized letters of consent from the other parent for international travel, but I'm having a hard time finding out if Australia takes this approach as well, and if so, whether actual notarization is required. Any pointers?
I'm fairly sure Japan doesn't care, but on the flip side, Japanese parents are rather notorious for abducting children from overseas, since the country was until this year not a Hague signatory.
And yes, I've seen this question, but fortunately the US is not involved in her itinerary...