A child travel consent form is strongly recommended if a child travels alone, with only one parent or an authorized adult. Parental consent is not required for in-state travel.The easiest way to obtain consent is to have it written in to a child custody agreement. See what documents a child needs to travel to or from the US alone or with a parent or relative. Non-US citizen children traveling to the US. A child travel consent form allows a minor to travel alone or with another person or group. While it's recommended to have notarised written consent, it's definitely not required and in my experience you're highly unlikely to be asked for it. The most common interpretation is that the traveling parent requires a notarized letter something not found in any custody order.