North Atlantic Tracks (NATs) are daily high altitude transatlantic routes between western Europe and the eastern coast of North-America, which provide consistent separation between aircraft. Westward tracks are named incrementally from the beginning of the alphabet (A,B,C...), with the northernmost tracks named first. Similarly, eastward tracks are named incrementally from the end of the alphabet (Z,Y,X...), with the southernmost tracks named first. Daily updates for each direction allow for routing around weather systems and tracking of favourable tailwinds to improve efficiency.

The map below shows the current valid NATs and the upcoming published NATs, along with the permissible flight levels in each direction.
Track Valid From Valid To Route East Levels West Levels
A 21 Jan 1130 UTC 21 Jan 1900 UTC 61/20 61/30 61/40 61/50 - 310 320 330 350 360 370
A 22 Jan 1130 UTC 22 Jan 1900 UTC 61/20 62/30 63/40 63/50 - 310 320 330 350 360 370
B 21 Jan 1130 UTC 21 Jan 1900 UTC 60/20 60/30 60/40 59/50 - 310 320 330 350 360 370
B 22 Jan 1130 UTC 22 Jan 1900 UTC 60/20 61/30 62/40 62/50 - 310 320 330 350 360 370
C 21 Jan 1130 UTC 21 Jan 1900 UTC 59/20 59/30 59/40 58/50 - 310 320 330 340 350 360 370 380 390
C 22 Jan 1130 UTC 22 Jan 1900 UTC 59/20 60/30 60/40 59/50 - 310 320 330 350 360 370 380 390
D 21 Jan 1130 UTC 21 Jan 1900 UTC 58/20 58/30 58/40 57/50 - 310 320 330 340 350 360 370 380 390
D 22 Jan 1130 UTC 22 Jan 1900 UTC 58/20 59/30 59/40 58/50 - 310 320 330 340 350 360 370 380 390
E 21 Jan 1130 UTC 21 Jan 1900 UTC 57/20 57/30 57/40 56/50 - 310 320 330 340 350 360 370 380 390
E 22 Jan 1130 UTC 22 Jan 1900 UTC 57/20 58/30 58/40 57/50 - 310 320 330 340 350 360 370 380 390
F 22 Jan 1130 UTC 22 Jan 1900 UTC 56/20 57/30 57/40 56/50 - 310 320 330 340 350 360 370 380 390
R 22 Jan 0100 UTC 22 Jan 0800 UTC 48/50 50/40 53/30 55/20 320 330 340 350 360 370 380 390 400 -
S 21 Jan 0100 UTC 21 Jan 0800 UTC 50/50 52/40 53/30 55/20 320 330 340 350 360 370 380 390 400 -
S 22 Jan 0100 UTC 22 Jan 0800 UTC 47/50 49/40 52/30 54/20 320 330 340 350 360 370 380 390 400 -
T 21 Jan 0100 UTC 21 Jan 0800 UTC 4930/50 5130/40 5230/30 5430/20 350 360 370 380 390 -
T 22 Jan 0100 UTC 22 Jan 0800 UTC 4630/50 4830/40 5130/30 5330/20 350 360 370 380 390 -
U 21 Jan 0100 UTC 21 Jan 0800 UTC 49/50 51/40 52/30 54/20 320 330 340 350 360 370 380 390 400 -
U 22 Jan 0100 UTC 22 Jan 0800 UTC 46/50 48/40 51/30 53/20 320 330 340 350 360 370 380 390 400 -
V 21 Jan 0100 UTC 21 Jan 0800 UTC 48/50 50/40 51/30 53/20 320 330 340 350 360 370 380 390 400 -
V 22 Jan 0100 UTC 22 Jan 0800 UTC 45/50 47/40 50/30 52/20 320 330 340 350 360 370 380 390 400 -
W 21 Jan 0100 UTC 21 Jan 0800 UTC 4730/50 4930/40 5030/30 5230/20 350 360 370 380 390 -
W 22 Jan 0100 UTC 22 Jan 0800 UTC 42/60 44/50 46/40 49/30 51/20 320 330 340 350 360 370 380 390 400 -
X 21 Jan 0100 UTC 21 Jan 0800 UTC 47/50 49/40 50/30 52/20 320 330 340 350 360 370 380 390 400 -
X 22 Jan 0100 UTC 22 Jan 0800 UTC 41/60 43/50 45/40 48/30 50/20 320 330 340 350 360 370 380 390 400 -
Y 21 Jan 0100 UTC 21 Jan 0800 UTC 46/50 48/40 49/30 51/20 320 330 340 350 360 370 380 390 400 -
Y 22 Jan 0100 UTC 22 Jan 0800 UTC 40/60 41/50 43/40 330 350 370 -
Z 21 Jan 0100 UTC 21 Jan 0800 UTC 41/60 44/50 47/40 48/30 50/20 320 360 380 400 -
Z 22 Jan 0100 UTC 22 Jan 0800 UTC 42/50 44/40 47/30 49/20 320 360 380 390 400 -
Warning: Do not use this data for real-world aviation or navigation. No guarantee of current accuracy is given.