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Jan 28, 2019 at 18:00 comment added StephenS FYI, the reason that the arrows between the stacks and the runways are so fat is that exactly where each plane turns will vary as needed to establish proper separation for merging traffic streams and variations in the ground speed in each direction due to wind intensity.
Oct 15, 2017 at 13:04 comment added David Richerby The prevailing wind at Heathrow (and, indeed, in most of the UK) is from the west, so the diagram shows the most common scenario.
Oct 13, 2017 at 19:16 history edited user14897 CC BY-SA 3.0
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Oct 13, 2017 at 19:13 history edited Trevor_G CC BY-SA 3.0
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Oct 13, 2017 at 19:07 history edited Trevor_G CC BY-SA 3.0
added 17 characters in body
Oct 13, 2017 at 17:13 history answered Trevor_G CC BY-SA 3.0