My 12 year old son, who is of no "legal" relation to me visits once or twice a year or so (flying alone in custody of the airline) and about 1 out of 3 times we get him back to mamma without being asked for paperwork at the airport.
Of course we always go prepared with all the required documents, which are no small hassle to get since his mother cannot be bothered to help much, but more and more I expect it will be the rule to be asked to present this documentation.
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