The Spanish ministry of Industry, Tourism and Commerce has launched new regulations for the use of mobile communications by aircraft passengers. The MCA (Mobile Communication on Aircraft) service will be available for subscribers of mobile operators that signed a roaming agreement with the MCA provider. Users will be able to access the service via their own mobile phones, being able to use the main features provided by terrestrial networks based on GSM technology. In order to increase the safety, security and control for the MCA service provision in a sensitive environment such as air traffic, the new regulations require the identification of operators. Operators that plan to provide in-fight mobile services on Spanish aircraft will need a special license. In the case of foreign aircrafts, the identification will be required via notification to the State Agency for Radio Communications, as, under international law on civil aviation, the space of the aircraft is considered under the jurisdiction of the country in which it is registered.