On 2005-10-08, Steven P. McNicoll wrote:
In the base that Canada uses for aircraft registration, when are letters
numbers?

All of them, as previously explained.

(As an aside to all the pedantry that's bouncing around this thread, I
think you must realise that 'numbers' is just an American figure of
speech; after all, in the US plane registrations are colloquially known
as 'N numbers', even though quite frequently the last one or two digits
is a letter, and is probably not intended to be base 36! In most other
countries, we just colloquially know our registrations as 'G-reg' or
'D-reg' or.. etc. without even mentioning the word 'numbers'. In this
part of the world, car registration plates are colloquially known as 'number
plates' even though they don't just have numbers, well, unless you live
in Guernsey).

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