A child travel consent form allows a minor to travel alone or with another person or group. My ex won't give travel consent form.I have the passport already. Some parents are able to travel absent notarized letters if their order of custody gives them passport authority. By filling out a child travel consent form, you can help ensure that airlines only allow your child to travel on approved trips. There is no standardissue minor travel consent form. How do I write a consent letter for my child to travel? According to the USA. Gov website, if a child is traveling abroad with one parent, the other parent must supply a notarized letter granting permission.