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Does anyone know the stack (holding) models for the JFK, Schiphol, Heathrow and Dubai airports? I mean, not where the aircraft hold but rather how is it planned and what concepts are used? Or how I can find that data?

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    $\begingroup$ I reworded your question a little, but I'm not sure exactly what you need. Are you asking for a map of where the aircraft hold, or for details of the holding planning concepts at each airport? Or something else? $\endgroup$ – Pondlife Jan 20 '17 at 21:00
  • $\begingroup$ yes, tnx sir... $\endgroup$ – somebody Jan 20 '17 at 21:24
  • $\begingroup$ I mean the second one @Pondlife $\endgroup$ – somebody Jan 20 '17 at 21:26
  • $\begingroup$ Do you want to know the leg size, radius, etc? Or something else? $\endgroup$ – mins Jan 20 '17 at 22:56
  • $\begingroup$ It looks like a homework question for university student $\endgroup$ – Him Dec 12 '17 at 13:53
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Most chars can be found in the local AIP. Most charts containing such data are the 'Standard Arrival' charts, such as location, heading and holding time.

For the Netherlands (Because you asked for Schiphol) it would be http://www.ais-netherlands.nl/aim/index.html

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Here is a website with some information about the holding points at Heathrow: https://nats.aero/blog/2013/06/infographic-why-do-aircraft-hold-at-heathrow-airport/ But it is really a case of trying different keywords in the search engine that are relevant. Holdings depend on the type of aircraft - due to wake turbulence - as lighter aircraft can not land after bigger aircraft due to violent turbulence that may cause major issues. Another factor is the air traffic in the area. This affects the number of levels the controllers use in the stack. Most holding points have 15 levels - from around 10,000 feet to 26,000 feet missing out 14,000 feet as this is the point where controllers can split the stack so that they have less planes to control at one time - this increases efficiency. As you probably know, aircraft must be 1000 feet apart from one another whilst in the stack or just generally on course. Holding points are split into 4 parts and normally take 4 minutes to complete one loop. Each part of the loop takes 1 minute. So if the pilot has a 8 minute delay he will be told by the controller to go around twice (two four minute loops) before he can be passed over to the approach controller in preparation for landing. This is just the basics of it really so I hope it helps.

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