Kilometres or miles
Kilometers
Since the US uses statute miles as a standard unit of distance, The distance between cities in Alabama would be expressed as miles.
Distances and vast lengths in the USA are measured in miles.
The best way to measure the distance between two cities is to calculate the mileage. You can input your starting point's address and your destination in Google maps to find the exact mileage.
Angstroms
The best unit to measure the distance from Fairbanks to Anchorage would be miles or kilometers. These units are commonly used to measure long distances between cities and are widely understood.
Meters or kilometers, depending on the distance.
Kilometers
Miles or kilometers.
Miles or kilometers.
Km
Me, I'm torn between the Smoot and the Parsec