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Old 17th Jun 2008, 08:45
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790119167
 
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Transition Altitude

Is anyone able to explain upon what basis transition altitudes are calculated? TA seems to vary from 3000ft amsl in the UK to around 17,500ft amsl in the US. Having used the UK TA in everyday calculations for several years now I would really like to be able to explain why it is set at the value it is...


Many thanks in advance for any insights!
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