Consent forms can be downloaded online or obtained from your airline or tour company. 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 travel consent form letter is required for each traveling child. In this guide, we will walk you through the process of apostilling a parental consent form for a minor's travel abroad. A Child Travel Consent Form is a legal document that allows a minor child to travel without both parents or legal guardians present. They will have a form with the required information. The intention of this letter is to provide consent for a minor child to travel without the company of both legal parents. The intention of this letter is to provide consent for a minor child to travel without the company of both legal parents. The most common interpretation is that the traveling parent requires a notarized letter something not found in any custody order.