Domanda 370, Human Performance and Limitations - ATPL - Airline Transport Pilot license

All pilots should master it because the aeronautical world needs one common language.
The composition of every crew should be geared to a command of the official aeronautical language of the destination country.
It is necessary and sufficient to have a command of any of the official languages of the ICAO.
Be familiar with normal procedures in English since only this allows for effective management of any flight's communication.