A child travel consent form is strongly recommended if a child travels alone, with only one parent or an authorized adult. This letter ensures the legitimacy of the accompanying parent's legal right to travel with the child.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. The most common interpretation is that the traveling parent requires a notarized letter something not found in any custody order. If the child has only one custodial parent, a notarized letter of consent from the nontraveling parent may be necessary. IMPORTANT NOTE: The written consent from the non-applying parent that accompanies an application for a new passport must be less than three months old. If only one parent is traveling with the child fill out subsection iii. Enter the traveling parent's name, passport number, country of issue and date issued. A travel consent form is a statutory document granting authorization for a minor to travel without legal guardians or one or both parents.