Well, given that we still use aeronautical charts marked in lat and long, and 1 nautical mile is a minute of latitude, that's a fair guess! It's just that we never renamed it the air-mile, and that name is now taken!
I believe that is the "geographic" nautical mile which will vary as the earth is an oblate spheroid and not a perfect sphere.
The International Nautical Mile is defined as 1852 metres.
Much more logical to have the ASI calibrated in Kts (nautical miles per hour) methinks.
A kilometre is one ten thousandth of the distance from the Pole to the Equator, hence 10,000 km = 5,400 nautical miles.