Know what documents a child needs to travel to or from the U.S. All children, including infants, must have their own travel documents. A child travel consent form allows a minor to travel alone or with another person or group.A letter from the person with parental responsibility for the child is usually enough to show you've got permission to take them abroad. A Child Travel Consent Form is required where a minor child under the age of 18 is traveling internationally without both parents present. 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. Provide your child's basic information. A Travel Consent Form is a letter of permission for travel is a document where a parent or guardian acknowledges that their minor will be traveling alone. 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. Children traveling alone can't check in online or at the kiosk. By filling out a child travel consent form, you can help ensure that airlines only allow your child to travel on approved trips.