ICAOICAO Annex 7
ICAO Annex 7 — Aircraft Nationality and Registration Marks
Read the official ruleAnnex 7 defines nationality and registration marks — the system behind tail numbers (N- for the U.S., G- for the UK, etc.) — and how aircraft are classified and registered, so every aircraft is uniquely identifiable internationally. *Summary only — consult ICAO and your registry.*
This is an original plain-English explanation for training and reference, not legal advice and not for navigation. Always rely on the current official rule linked above. Last reviewed June 2, 2026.