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 notarized letter of consent is a crucial requirement when traveling with minors without both 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. The most common interpretation is that the traveling parent requires a notarized letter something not found in any custody order. The DS3053 form is for situations where only one parent or guardian is able to fill out the paperwork. A child travel consent form is strongly recommended if a child travels alone, with only one parent or an authorized adult.