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Old 10th December 2003 | 01:29
  #3 (permalink)  
zerozero
 
Joined: Jun 2001
Posts: 518
Likes: 0
From: Chicago, IL, USA
One more reason

I've requested blocks due to inability to maintain altitude due to mountain wave action--or just plain old-fashioned turbulence.

Severe icing or engine-out ops may be other good reasons to request blocks.
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