Flying through the correct weather system can actually improve the fuel efficiency. For example, it is more efficient for an east-bound flight to fly through the North of a low pressure system in the Northern Hemisphere. The problem with the current fixed route system is that the flight path is determined long before departure and by the time the flight departs, the weather most likely has changed. Also, the route does not take into account of the aircraft being used nor flight load. By using UPR, the airlines can determine the optimal flight path based on the most current weather conditions, and other factors which will probably result in a more optimal path.
At the end, this saves the airlines money (ok...and helps the environment too). So I guess this is a win-win situation.
Source: JAL Press Release
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