national law says you must have a letter with permission. The fact that often airlines do not check does not change the law. How often have you seen someone speed or not come to a full stop at a stop sign without them getting a ticket?
I'm truly amazed by the people who are digging in their heels with "not in my country" even when confronted with the facts, lol. I don't know what's wrong with people.
meanwhile, it’s not possible to be a sole parent. If the other parent is deceased or you have sole custody, you make need to prove such in lieu of permission. I’m not sure why you’re arguing. This information is readily available.
ignorance is bliss; isn’t it? “If the child is accompanied by only one parent, the parent should have a note from the child's other parent. For example, ‘I acknowledge that my wife/ husband is traveling out of the country with my son/ daughter. He/She/ has my permission to do so.’”