AIRCRAFT NATIONALITY AND REGISTRATION MARKS
Nationality, common and registration marks to be used
The nationality or common mark and registration mark shall consist of a group of characters.
The nationality or common mark shall precede the registration mark. When the first character of the registration mark is a letter, it shall be preceded by a hyphen.
The nationality mark shall be selected from the series of nationality symbols included in the radio call signs allocated to the State of Registry by the International Telecommunication Union. The nationality mark shall be notified to the International Civil Aviation Organization.
The common mark shall be selected from the series of symbols included in the radio call signs allocated to the International Civil Aviation Organization by the International Telecommunication Union.
Note : Assignment of the common mark to a common mark registration authority will be made by the International Aviation Organization.
The registration mark shall be letters, numbers, or a combination of letters and numbers, and shall be that assigned by the State of Registry or common mark registering authority.
When letters are used for the registration mark, combinations shall not be used which might be confused with the five-letter combination used in the International Code of Signals, Part II, the three-letter combinations beginning with Q used in the Q code, and with the distress signal SOS, or other similar urgent signals, for example XXX, PAN and TTT.
Note : For reference to these codes, see the currently effective International Telecommunication Regulations.