19 19 The Aviation Management Convention signed in Paris stipulates the country code of the civil aviation aircraft of the signatory countries. The Convention on International Civil Aviation was amended many times when it was signed in Chicago on 1944. The code in China is "B", the code in the United States is "N" and the code in Britain is "G". Civil aviation aircraft also have airline logo (aviation emblem) and serial number logo, as well as emergency and ambulance logo. Aviation logo is a kind of commercial logo, also known as service trademark.

Aircraft nationality symbol is a symbol to identify the nationality of aircraft. The nationality mark of an aircraft is composed of characters, which is selected from a series of nationality codes in the line call signal assigned by the International Telecommunication Union to the country where the aircraft is registered, and the nationality mark is notified to the civil aviation organization of nationality.