Airline flight path scheduling is a complicated process where wind and weather patterns are only one aspect of the route taken. Most trans atlantic and trans pacific routes operates with well known "highways" that are strictly adhered to. Apart from weather/wind, load factors, crew certification, craft certification, traffic congestion are some of the factors that existing automated flight route programs already factor. There is a youtube documentary that details the flight scheduling process. Additionally, for the more interested airliners.net's forums has a large trove of information talking about the same topic.