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18 votes
Accepted

Why does this Curtiss Kittyhawk have a Question Mark in its squadron code?

It was fairly common to use “?” if there were more than 26 aircraft in the squadron. (only 26 letters in the alphabet) Camouflage and markings of No.112 Squadron RAF, “The second thing is the use of ...
Mike Sowsun's user avatar
  • 37.8k
14 votes
Accepted

Why do Airbus A220s manufactured in Mobile, AL have Canadian test registrations?

The airplanes are built/owned by an Airbus subsidiary incorporated in Canada, and the Mirabel facility is still the primary production facility and location for the engineering organization, etc. ...
John K's user avatar
  • 132k
5 votes
Accepted

N-Number to ADS-B mode s code relationship

In the United States, the ICAO hex code and the tail number are related algorithmically. The code A00001 (in hex, 50000001 in octal) is given to tail number N1, A00002 to N1A, and so on in ...
Chris's user avatar
  • 16k
3 votes

Why do Airbus A220s manufactured in Mobile, AL have Canadian test registrations?

The various certification organizations have reciprocity agreements. When the FAA certifies an aircraft, Europe, Canada, Australia, etc. accept that certification. That way, Boeing (for example) ...
Rob McDonald's user avatar
  • 13.2k

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