Use our Child Travel Consent form to prove that a child can travel without their parents or guardians. If children are not travelling with both their parents, (ie: if they are travelling alone, or with another adult), this form can be used to give permission.Children under 18 may need a Letter of Consent to travel internationally without both parents. Country-specific regulations. A child travel consent form allows a minor to travel alone or with another person or group. Know what documents a child needs to travel to or from the U.S. All children, including infants, must have their own travel documents. Our son will be 17 when we travel to Europe in the spring. Our son will be 17 when we travel to Europe in the spring. My child to travel; in the school vehicles. 2. Founded in 1775, the Marines are an elite fighting force with the courage to engage in every battle—and the will to win.