A Child Travel Consent Form (or Letter of Permission) is a formal document used when a minor under the age of 18 is traveling without both legal parents or guardians. This is a critical document for 2026 international travel as it helps prevent international parental child abduction and ensures that the child has the legal authority to cross borders. The letter should include the child's full name, birth details, passport information, and the travel itinerary, along with the contact information and signatures of the non-traveling parent(s). To be legally robust, most immigration authorities (especially in the US, Canada, and the UK) strongly recommend that the letter be notarized to verify the authenticity of the signatures. If the child is traveling with a school group, a grandparent, or only one parent, this document acts as "proof of consent" for the supervising adult to act on the parents' behalf. Carrying a copy of the child's birth certificate alongside the notarized letter is a "best practice" that ensures a smooth process through airport security and passport control.