An Airworthiness Certificate is the document that accredits the aircraft to which it refers, as being in a position to fly by meeting certain safety requirements. 
AESA would be the authority responsible for issuing Airworthiness Certificates for aircraft that are or will be registered in Spain. 

The Station License is mandatory for any aircraft with Spanish registration that has emitting aeronautical equipment.

GPS equipment should not appear on the station license.

A Flight Authorisation (also called Flight Permit) is a permit that is normally issued when the Airworthiness Certificate is temporarily invalid and the aircraft is required to fly for established reasons. 

Non-EASA aircraft, are those types of aircraft by which they are excluded from EASA Regulation 2018/1139. Among these types are ultralight motorised aircraft called ULM, Historical, Experimental, Amateur Construction Aircraft. Also excluded from the EASA regulations are those aircraft that are used in the use of military operations, patrol boats, police, etc. For more details of which aircraft are excluded, you can consult Regulation 2018/1139, in its Article 2.3(a) and Annex I.

WIFI equipment should not appear on the station license.

It would not be able to fly unless a permit to fly is presented whereby the safety of the flight is not compromised and duly justified.

The appointment must be made in writing by the quality manager of the organisation, which is prior to the start of the OJT. There must also be a signature of “received” by the data subject (evaluator or supervisor) in order to justify that he is aware of his or her role. There is no established format for such appointments.