About ICAO. In: icao.int. ICAO, abgerufen am 18. November 2019 (englisch).
Member States.English.pdf. (PDF; 135 kB) ICAO, abgerufen am 20. Juli 2014 (englisch).
The Minister of Switzerland made the following statement in the note transmitting the Swiss Instrument of Ratification:
"My Government has instructed me to notify you that the authorities in Switzerland have agreed with the authorities in
the Principality of Liechtenstein that this Convention will be applicable to the territory of the Principality as well as to that of the Swiss Confederation, as long as the Treaty of 29 March 1923 integrating the whole territory of Liechtenstein with the Swiss customs territory will remain in force".