Have the Travel Consent Form filled out, but do not sign it beforehand; this needs to be done in the notary's presence. 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.1. Follow state Notary requirements. A parent who needs their signature notarized must personally appear before you. Authorization Letter. Travel Consent Letter. By filling out a child travel consent form, you can help ensure that airlines only allow your child to travel on approved trips. Authorized Individuals: Specify who is authorized to consent to medical treatment on behalf of the child in the absence of the parent or legal guardian. 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.