A travel consent form letter is required for each traveling child. 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 a legal document that allows a minor child to travel without both parents or legal guardians present. How do I write a consent letter for my child to travel? Does anyone know where I can find a form to authorize travel for my grandson cruising with me, and not with his parents? Consent forms can be downloaded online or obtained from your airline or tour company. Do you need a permission letter to travel with child? May 1, 2002; San Diego, CA USA. You need an appointment to submit your passport application at the County Administration Center. You can schedule an appointment up to two weeks in advance.