Kilometres is the 'native' unit for normal people thinking about driving, flying or shipping in most metric countries (obviously pilots and sailors use different units, like nautical miles, but for regular passengers it's km).
All road signs, the distance indicator on the entertainment system in planes, etc. are always set out like that (e.g. 1617 km to Cairns, or 11,980 km to Dubai).
From my point of view (whole life in a country that is exclusively metric), it would be really strange to see this kind of distance written in millions of metres or megametres. Would feel totally unintuitive.
All road signs, the distance indicator on the entertainment system in planes, etc. are always set out like that (e.g. 1617 km to Cairns, or 11,980 km to Dubai).
From my point of view (whole life in a country that is exclusively metric), it would be really strange to see this kind of distance written in millions of metres or megametres. Would feel totally unintuitive.