Route Planning
The specific routing of the tracks are dictated based on a number of factors, the most important being the jetstream—aircraft going from North America to Europe experience tailwinds caused by the jetstream. Tracks to Europe use the jetstream to their advantage by routing along the strongest tailwinds. Because of the difference in ground speed caused by the jetstream, westbound flights tend to be longer in duration than their eastbound counterparts. North Atlantic Tracks are published by Shanwick Center (EGGX) and Gander Center (CZQX), in consultation with other adjacent air traffic control agencies and airlines.
Read more about this topic: North Atlantic Tracks
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