If you are both hearing and visually impaired, you must travel with a companion. You can also travel with a guide dog who can accompany you onboard free of charge.  However, you will be required to make your Turkish Airlines reservation or booking for your dog a minimum of 48 hours in advance. Your guide dog must also: ● Remain leashed and seated by your feet during your travel. ● Have all valid medical documents—such as health reports, ID card, vaccination certificates, etc