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I just wanna take time and thank you for your lovely service, I have found someone on the site and ohhhh boy!!!I feel like I'm falling in love for the first time...This results in much more efficiency by reducing fuel burn and flight time.To make such efficiencies possible, the routes are created twice daily to take account of the shifting of the winds aloft and the principal traffic flow, eastward in North America evening and westward twelve hours later.Entrance and movement along these tracks is controlled by special Oceanic Control Centres air traffic controllers to maintain separation between airplanes.The primary purpose of these routes is to allow Air Traffic Control to effectively separate the aircraft.
While the routes change daily, they maintain a series of entrance and exit waypoints which link into the airspace system of North America and Europe.
The first implementation of an Organised Track System across the North Atlantic was in fact for commercial shipping, dating back to 1898 when the North Atlantic Track Agreement was signed.
After World War II, increasing commercial airline traffic across the North Atlantic led to difficulties for ATC in separating aircraft effectively, and so in 1961 the first occasional use of NAT Tracks was made.
Because of the volume of NAT traffic, allowing aircraft to choose their own co-ordinates would make the ATC task far more complex.
They are aligned in such a way as to minimize any head winds and maximize tail winds impact on the aircraft.