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Message: <blockquote data-quote="Vipersan" data-source="post: 979149" data-attributes="member: 325666">Thanks Chris ..I was about to ask the obvious question.I freely admit I dont know the answer to this .Maybe some thing to do with Rotation ..Coriolis effect..wind speeds..or some such.or so I thought....why go so far out of your way south to advance west ?It must cost a lot of fuel , doubling the distance travelled.Then I think it hit me like a brick..Think in 3 dimensions.The globe map is a flattened sphere ...but the actual track of the plane is a straightish line so would appear to curve down and up ..but is actually straighter than it appears.?????</blockquote>