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since air travel can fly a more direct route, not having to circumnavigate land mass, it would be the shortest distance.
The geographical position of the Suez Canal makes it the shortest route between East and West as compared with the Cape of Good Hope. The Canal route achieves saving in distance between the ports north and south of the Canal.
The Panama Canal is the shortest route.
The shortest route between two points is a straight line. But since the Earth is round (try bending a ruler along the surface of a basketball or something), the shortest route between two points on a globe will look like a curve when seen o a flat map. And since people wanted Titanic to cross the Atlantic as fast as possible, the shortest route possible is also the most northern route, and she ended up in iceberg territory.
The distance between the above places is approximately equal to 3894 nautical miles. To convert miles to nautical miles, multiply the miles by 0.86. This is point to point straight distance. The actual distance will change according to the route.
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A straight line
the shortest air route is a great circle
since air travel can fly a more direct route, not having to circumnavigate land mass, it would be the shortest distance.
chennai to tehran, paris and london
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Great Circle Route
The shortest route between two points on the surface of a planet, when routes are limited to the planet's surface, is the arc of the great circle that connects the two points. The shortest route between two points anywhere, without regard to intervening matter or energy preventing the route from being followed, is always the line connecting the two points.
It was the Suez Canal, which was a short cut between the Mediterranean Sea and the Indian Ocean, leading to India, Australia and Asia.
If you mean by the words "direct route" the shortest distance between two places, distances between two places are shortest at the equator, because of the shape of the planet. If you mean which direction should be traveled to minimize distance, the route taken should be as straight a line as possible.
The geographical position of the Suez Canal makes it the shortest route between East and West as compared with the Cape of Good Hope. The Canal route achieves saving in distance between the ports north and south of the Canal.
Because that location is the lowest, shortest route between oceans.