See what documents a child needs to travel to or from the US alone or with a parent or relative. Non-US citizen children traveling to the US.The form linked below is permission to travel. Download and fill it out. While it's recommended to have notarised written consent, it's definitely not required and in my experience you're highly unlikely to be asked for it. NOTE: No letterhead or logos are allowed. Answer: Parental consent is not required for domestic travel. You should get a notarized letter of consent from your exhusband, confirming his consent to having the children travel with you outside of the United States. It depends on the airline for domestic travel. As Enterprise Mobility, we're reaffirming our dedication to every journey and every person through people-first mobility experiences.