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Old 21st Dec 2018, 17:54
  #4 (permalink)  
Join Date: Sep 2007
Location: London
Posts: 490
I read a thesis a few years ago examining the feasibility of flying LHR - SYD non stop which included some Jeppeson flight plans. The shortest route in each direction varied considerably by season - it could mean overflying HKG or Tokyo. Obviously winds vary day by day ,not just by season, and changes can make quite different routings the most economic. Also, I don't know if it is the case here but overflying rights and costs can result in different routes being taken.
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