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Explanation: The phrase "annual winds" is frequently appeared in specification sheet of planes. It seems that "annual winds" is one of many factors to estimate reachable range of planes. I guess, in the asker's context, "85% Boeing annual winds" means 85% of annual average of wind vector is used to estimate something as the Boeing Company used.
Explanation: The phrase "annual winds" is frequently appeared in specification sheet of planes. It seems that "annual winds" is one of many factors to estimate reachable range of planes. I guess, in the asker's context, "85% Boeing annual winds" means 85% of annual average of wind vector is used to estimate something as the Boeing Company used.
The translation workplace 
