For what purpose? What context? You have given no information about the requester or the request.
en-AU, en-CA, en-GB, en-IE, en-NZ, en-US, and en-ZA are the usual ways of doing these things.
> On 12 Nov 2017, at 09:08, Gerard Meijssen <gerard.meijssen@gmail.com> wrote:
>
> Hoi,
> There is a request for a code for Australian and USAmerican English. For use in Wikidata there is imho no reason why not to allow it.
> Thanks,
> GerardM
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