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Jan 23, 2019 at 20:16 comment added Terry @StephenS As you say, N was assigned to the U.S. in 1919, and a second letter allowed, which was, as I understand it, C for standard. Thus NC was used until 1948, when new aircraft were required to use just N. More info on faa.gov/licenses_certificates/aircraft_certification/….
Jan 23, 2019 at 16:38 comment added StephenS @GiacomoCatenazzi Edited to account for multiple prefixes. The UN only uses its prefix for its own aircraft, i.e. no other party can register its planes with them, so it's not worth the added complexity.
Jan 23, 2019 at 16:35 history edited StephenS CC BY-SA 4.0
multiple prefixes, three-letter prefixes
Jan 23, 2019 at 16:34 comment added StephenS @Terry The US has had all of N since 1919. However, N-C, N-L, N-R, and N-X were used for civil aircraft to denote the certificate type until that was abolished a few decades ago (many countries have similar schemes), and now they use just N for all aircraft.
Jan 23, 2019 at 15:18 comment added CrossRoads In the US, Ultralight aircraft (basically weighing under 254 pounds, with some fuel limits and 2 passengers max) are not required to be registered. That does impose some limits on where they area allowed to fly usua.org/Rules/ruleandregs.htm
Jan 23, 2019 at 14:08 comment added Giacomo Catenazzi Not only countries has a prefix (United Nations: 4U), and not all countries have only one prefix (Brazil has PP to PU), see: en.wikipedia.org/wiki/List_of_aircraft_registration_prefixes
Jan 23, 2019 at 8:17 comment added Terry A historical note: The U.S. used to use NC. The change was made to just N when I was a boy. I think, but am not certain, that antique aircraft that originally were registered with NC are allowed to continue using that.
Jan 23, 2019 at 5:09 comment added AirCraft Lover Thank you my friend.
Jan 23, 2019 at 3:25 comment added StephenS Yes, in the same way a car license plate number "belongs" to the country that assigns it--even for commercial vehicles.
Jan 23, 2019 at 1:58 comment added AirCraft Lover So clearly, it is belong to a country, not to an airline company, right?
Jan 23, 2019 at 1:57 comment added AirCraft Lover Thank you my friend. You made the explanation easy.
Jan 23, 2019 at 1:57 vote accept AirCraft Lover
Jan 23, 2019 at 1:11 history answered StephenS CC BY-SA 4.0