OBS_VALUE: Art. 18) It is a prerequisite to obtain permission from the Ministry of Transport for commercial purposes in order to carry passengers or cargo or passengers and cargo by aircraft in return for a fee, and to carry out other activities for commercial purposes. Art. 19) Real persons or legal entities that will carry passengers or cargo or passengers and cargo on certain routes for commercial purposes, for a fee, must obtain an operating license from the Ministry of Transport, apart from the permission specified in Article 18.