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GR4 Supersonic ?
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30th Aug 2013, 22:42
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Geezers of Nazareth
Join Date: Aug 2007
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What's the normal operating height for a GR4 then? ... I normally see them pootling around at FL240 to about FL280. Earlier this week one was at FL380 over Anglia, and I don't recollect seeing one that high before.
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