On Sunday, November 16, 2014 1:01:43 AM UTC-5, Glen Labah wrote:   
      
   > In the case of Sea-Tac it sits at the top of a ridge that is the only   
   > non-water flat spot of significant size anywhere nearby.  Another runway   
   > would mean a massive fill project to turn a valley or two into flat   
   > areas.   
      
   Many airports across the country face similar constraints.   
      
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