The intention of this letter is to provide consent for a minor child to travel without the company of both legal parents. A child travel consent form is strongly recommended if a child travels alone, with only one parent or an authorized adult.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. Yes, Customs and Immigration will ask a single parent for proof that they have the other parent's permission to travel out of the country with their children. 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. 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. According to the USA.