A child travel consent form is strongly recommended if a child travels alone, with only one parent or an authorized adult. A child travel consent form allows a minor to travel alone or with another person or group.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. Permission for a Minor to Travel with one Parent. Affidavit of Other Parental Consent. 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. 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. The most common interpretation is that the traveling parent requires a notarized letter something not found in any custody order.