What kind of letter do you write to give your daughter permission to go on a flight with her aunt?

To give your daughter permission to fly with her aunt, write a consent letter that includes your daughter’s full name, the aunt's full name, and details of the flight, such as the date and destination. Clearly state that you authorize the aunt to take your daughter on this trip and include your contact information for any inquiries. Sign and date the letter, and consider having it notarized for added authenticity.