OBS_VALUE: Licenses for the provision of groundhandling services to third parties or in self-handling in airports are valid until the expiry of the underlying licenses for use of the public domain, although the regulator may set periods for periodical revalidation of no less than one year. The activity access licenses expire one year after the date of issuance, if the holder does not obtain, within that period, the corresponding license for use of the public domain.Permits for freight forwarding firms are non-transferable and issued for a period not exceeding five years, renewable upon proof that the requirements for access to the activity are maintained.