I'm pretty sure there's grounds to include it, seeing as how:
- Northwest Territories Parks and the Northwest Territories Health and Social Services Authority both use the short form NWT, as does the government department Prosper NWT,
- The website of the Government of Canada occasionally uses NWT to refer to the Northwest Territories,
- Official legislative documents in the Northwest Territories often refer to it as NWT,
- PEI is an accepted type-in for Prince Edward Island,
- A search online for "NWT" brings up a full page of exclusively results about the Northwest Territories for me,
- And it's really annoying to have to type Northwest Territories every time the answer comes up on a quiz.
So, anyways, would it be possible to get NWT as a standardized type-in?