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 Post subject: klax flightpath
PostPosted: Sat Oct 11, 2014 7:21 am 
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pdungan - FlightAware user avatar

Joined: Tue Sep 03, 2013 2:27 pm
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I was just wondering why flightplan tracks on flightaware for example frankfurt/london Heathrow to Los Angelos nearly always have n shaped tracks instead of having straighter curved tracks?


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 Post subject: Re: klax flightpath
PostPosted: Sat Oct 11, 2014 2:32 pm 
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bovineone - FlightAware user avatar

Joined: Wed Jul 27, 2005 3:00 am
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Can you give some specific example flight URL?


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 Post subject: Re: klax flightpath
PostPosted: Sat Oct 11, 2014 4:55 pm 
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pdungan - FlightAware user avatar

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Virgin Atlantic (vir 23) from egll to klax


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 Post subject: Re: klax flightpath
PostPosted: Sun Oct 12, 2014 12:05 pm 
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mustangjosh350 - FlightAware user avatar

Joined: Fri Nov 30, 2012 10:50 pm
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I'm guessing its b/c it saves time/fuel or the airlines that do it are restricted to do that. I was wondering the same thing here why airlines don't fly straight West to East or East to West.


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 Post subject: Re: klax flightpath
PostPosted: Sun Oct 12, 2014 12:32 pm 
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bovineone - FlightAware user avatar

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Flight paths appear curved due to the flat map (mercator projection), but are actually not quite as curved in reality. This is known as a "great circle" path.

Try it for yourself by finding a physical globe (spherical) and trying to stretch a piece of string between those two distances. You'll find that the string seeks to the shortest distance, which will cross over roughly the same locations that the "curved" path took.

There are generally some slight deviations from the perfect "great circle" path, but those are usually due to weather or jetstream conditions dictating more efficient routes. Transoceanic flights will also sometimes try to remain as close to a shore as possible minimize the amount of time they have to be over water should an emergency occur, but most of the curvature is still due to great circle projection issue.


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 Post subject: Re: klax flightpath
PostPosted: Sun Oct 12, 2014 1:46 pm 
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pdungan - FlightAware user avatar

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I find on flightaware that a lot of these flights fly at coordinates 65-6900north at the furthest point north and no less eg 55-5900n why is this


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 Post subject: Re: klax flightpath
PostPosted: Sun Oct 12, 2014 2:27 pm 
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joelwiley - FlightAware user avatar

Joined: Mon Mar 12, 2012 7:46 pm
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pdungan wrote:
I find on flightaware that a lot of these flights fly at coordinates 65-6900north at the furthest point north and no less eg 55-5900n why is this

Try plugging
mercator great circle navigation
into google


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 Post subject: Re: klax flightpath
PostPosted: Wed Dec 10, 2014 9:48 pm 
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invergordon - FlightAware user avatar

Joined: Wed Jan 01, 2014 4:18 pm
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A more simpler explanation is to obtain a globe, blow up ones are cheap for this purpose that's a sphere of the world, and draw a straight line between the two cities and you'll see that when the globe is 'laid flat' that the route looks quite different although is still the same, the shortest route on our curved planet.


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 Post subject: Re: klax flightpath
PostPosted: Thu Dec 11, 2014 9:31 am 
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porterjet - FlightAware user avatar

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Winds aloft are also part of the calculation. Typically the jet stream is eastbound accross the Northern Hemisphere between 30 degrees and 50 degrees North lattitude. (not exact but close) Eastbound airplanes will fly close to the jetstream in order to catch the tailwind. Westbound airplanes, especially long haul flights, end up north of the jetstream by several hundred miles. That is one reason you see a lot of Europe to west coast flights up across mid to north Greenland where on the same day the eastbound flights are down around southern Greenland.

The great circle route between London and LAX crosses Northern Ireland, very Southern Greenland, Hudson Bay and Eastern Montana.


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