How are flight paths decided?

How does an airline decide which route to take? — Todd Frederick, Wheat Ridge, Colo. Answer: Often there is preferred routing provided by air traffic control to help smooth the traffic flow. Otherwise the most efficient route, taking into account winds and turbulence forecasts, is filed.



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The FAA is a year-round, 24/7 operation, responsible for 5.3 million square miles of U.S. domestic airspace and 24 million square miles of U.S. airspace over the oceans. There are 43,290 average daily flights in and out of the U.S.

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As the runway in use changes, the flight paths in use will change, and so too do the suburbs affected by aircraft movements. The runway in use at any given time and the direction of the traffic flow will vary primarily according to the wind conditions at the airport.

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Because of its vast size, crossing the Pacific Ocean requires a staggering quantity of fuel. However, most commercial aircraft do not fly directly over the Pacific Ocean; instead, they choose what are known as 'curved paths'. These paths offers a faster, more efficient route given the curved nature of the earth.

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Currently, the bragging rights for the longest flight in the world belong to Singapore Airlines' New York City to Singapore route. Its longest flight path, which connects Singapore's Changi Airport with New York's John F. Kennedy International Airport, 9,585 miles away, takes 18 hours and 40 minutes.

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Thanks to the low visibility and undeveloped infrastructure, flying over Antarctica is extremely difficult. Specifically, because of the strong magnetic fields that surround the polar regions, navigating there, no matter how well-equipped the airplane is in terms of instrumentation, can be particularly challenging.

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Airlines quickly realized the value of jet streams and began implementing them while planning routes. Since the jet streams flow from west to east, they make one leg of the journey much faster (when flying with the stream) and one slower (against the stream).

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The Loganair Westray to Papa Westray route is the shortest scheduled passenger flight in the world. Flights on the route are scheduled for one and a half minutes, and actual flying time is closer to one minute. The record for the fastest flight is 53 seconds.

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Pilots have a unique viewpoint while flying private or commercial aircraft. They get an unobstructed view of stunning natural sights, such as pink lakes and rectangular-shaped icebergs. Some have reported seeing UFOs, while others have flown over swirling hurricanes.

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At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres. Using this instrument, the pilot can determine whether the aircraft is in a climb, a dive, or rolling.

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In modern aircraft with modern avionics, the descent profile is automatically calculated by the computers. When prevailing winds are entered the flight management system can accurately determine the top of descent and the rate of descent that is required.

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Because the Earth is a three-dimensional sphere and not merely a two-dimensional flat, East-West surface. Because of this spherical shape, often times the shortest distance is flying more north and south, up over the Northern latitudes and the North Pole, rather than flying east/west over the Pacific.

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Aerodynamic altitude: If a commercial airliner flies too high, it will encounter less dense air passing over the wings to create lift. This can cause the plane to stall and fall out of control. Depending on the weather conditions and aircraft weight, this can occur anywhere between 40,000 and 45,000 feet.

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Altitude and emergency descent The leading reason for aircraft avoiding the region is the high average height of the terrain.

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