Airplanes often make use of the jet stream during their treks across the world. If the Gaang caught one of those South-North/North-South jet stream 'highways,' then they very well could have made it to where they were going in a few hours. These are more common in Spring and Summer and less common during Fall and Winter because these bends in the jet streams are created by temperature variances. Depending on the time of year, there could be more or fewer troughs/ridges meaning more South-North/North-South traveling jet streams. Midlatitude cyclones (Low pressure systems with cold/warm/occluded fronts) travel along these troughs while High pressure areas (ridges) typically have calm, sunny weather. But while true, jet streams typically run East-West, they also run South-North and North-South depending on the trough/ridge patterns. So there would be no "fast lanes" North-South.
That's where the beauty of jetstreams comes in, they run predominately East-West.
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