CityMeter is the app that allows you to calculate the distance as the crow flies between two cities on earth.
Just enter your name and the county (or state) of the city of departure and arrival city and the rest will CityMeter, internet connection and calculating the distance between two points on the planet.
The application requires an internet connection.
The interface is in English.
This demo version is limited in what you can do only three measurements per day and includes banner ads. By purchasing the full version is unlimited and can make measurements to remove the banner.