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Better to know the model you are using, if only to understand its limitations, than to kid yourself you have moved to a deeper, model-free plane.
ECONOMIST: Knowing your place
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This is a special type of Earth model which traces its idealised "horizontal" surface - the plane on which, at any point, the pull of gravity is perpendicular to it.
BBC: Europe's Goce satellite probes Earth's gravity
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"I am wary of a plane model that has fire problems and leaks fuel, " said Atlanta-based businessman Bobby Burns, a project manager who takes more than 50 trips a year.
CNN: STORY HIGHLIGHTS