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Old 13th Jan 2015, 09:14
  #36 (permalink)  
Dominator2
 
Join Date: Mar 2008
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BEagle,

Thanks for restating all of the info but my question is, why 90 mins? How was that time decided? Is it the same for single engined and twin engined fast jets? 90 mins would appear to be a bit arbitrary or is it based on certain criteria?
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