A Type A Airport Transit Visa is required for nationals of certain non-Schengen countries who need to pass through an Estonian international airport while waiting for a connecting flight, without entering Estonian territory. This visa only permits the holder to remain within the international transit zone and does not allow entry into Estonia or the Schengen Area. Whether this visa is required depends on the applicant's nationality. Travellers with connecting flights through Schengen airports are advised to confirm the requirement with the Estonian embassy or their airline before booking their travel.