We already do [1]: > They are aligned in such a way as to minimize any head winds and maximize tail winds impact on the aircraft. This results in much more eff

We already do [1]: > They are aligned in such a way as to minimize any head winds and maximize tail winds impact on the aircraft. 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. [1] https://en.wikipedia.org/wiki/North_Atlantic_Tracks https://en.wikipedia.org/wiki/North_Atlantic_Tracks