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 24 May 1130 UTC 24 May 1900 UTC 58/20 60/30 61/40 62/50 - 310 320 330 350 360 370 380 390
A 25 May 1130 UTC 25 May 1900 UTC 58/20 60/30 61/40 62/50 - 310 320 330 350 360 370 380 390
B 24 May 1130 UTC 24 May 1900 UTC 55/20 56/30 56/40 55/50 - 310 320 330 340 350 360 370 380 390
B 25 May 1130 UTC 25 May 1900 UTC 57/20 59/30 60/40 61/50 - 310 320 330 350 360 370 380 390
C 24 May 1130 UTC 24 May 1900 UTC 54/20 55/30 55/40 54/50 - 310 320 330 340 350 360 370 380 390
C 25 May 1130 UTC 25 May 1900 UTC 56/20 58/30 58/40 56/50 - 310 320 330 340 350 360 370 380 390
D 24 May 1130 UTC 24 May 1900 UTC 5330/20 5430/30 5430/40 5330/50 - 350 360 370 380 390
D 25 May 1130 UTC 25 May 1900 UTC 55/20 57/30 57/40 55/50 - 310 320 330 340 350 360 370 380 390
E 24 May 1130 UTC 24 May 1900 UTC 53/20 54/30 54/40 53/50 - 310 320 330 340 350 360 370 380 390
E 25 May 1130 UTC 25 May 1900 UTC 5430/20 5630/30 5630/40 5430/50 - 350 360 370 380 390
F 24 May 1130 UTC 24 May 1900 UTC 52/20 53/30 53/40 52/50 - 310 320 330 340 350 360 370 380 390
F 25 May 1130 UTC 25 May 1900 UTC 54/20 56/30 56/40 54/50 - 310 320 330 340 350 360 370 380 390
G 24 May 1130 UTC 24 May 1900 UTC 51/20 52/30 52/40 51/50 - 310 320 330 340 350 360 370 380 390
G 25 May 1130 UTC 25 May 1900 UTC 53/20 55/30 55/40 53/50 - 310 320 330 340 350 360 370 380 390
H 24 May 1130 UTC 24 May 1900 UTC 46/40 43/50 - 320 340 360 380
H 25 May 1130 UTC 25 May 1900 UTC 52/20 54/30 54/40 52/50 - 310 320 330 340 350 360 370 380 390
J 24 May 1130 UTC 24 May 1900 UTC 45/40 41/50 35/60 - 320 340 360 380
S 25 May 0100 UTC 25 May 0800 UTC 51/50 52/40 54/30 56/20 320 330 340 350 360 370 380 390 400 -
S 26 May 0100 UTC 26 May 0800 UTC 52/50 52/40 53/30 54/20 320 330 340 350 360 370 380 390 400 -
T 26 May 0100 UTC 26 May 0800 UTC 51/50 51/40 52/30 53/20 320 330 340 350 360 370 380 390 400 -
T 25 May 0100 UTC 25 May 0800 UTC 50/50 51/40 53/30 55/20 320 330 340 350 360 370 380 390 400 -
U 26 May 0100 UTC 26 May 0800 UTC 50/50 50/40 51/30 52/20 320 330 340 350 360 370 380 390 400 -
U 25 May 0100 UTC 25 May 0800 UTC 49/50 50/40 52/30 54/20 320 330 340 350 360 370 380 390 400 -
V 25 May 0100 UTC 25 May 0800 UTC 48/50 49/40 51/30 53/20 320 330 340 350 360 370 380 390 400 -
V 26 May 0100 UTC 26 May 0800 UTC 4930/50 4930/40 5030/30 5130/20 350 360 370 380 390 -
W 25 May 0100 UTC 25 May 0800 UTC 4730/50 4830/40 5030/30 5230/20 350 360 370 380 390 -
W 26 May 0100 UTC 26 May 0800 UTC 49/50 49/40 50/30 51/20 320 330 340 350 360 370 380 390 400 -
X 25 May 0100 UTC 25 May 0800 UTC 47/50 48/40 50/30 52/20 320 330 340 350 360 370 380 390 400 -
X 26 May 0100 UTC 26 May 0800 UTC 48/50 48/40 49/30 50/20 320 330 340 350 360 370 380 390 400 -
Y 26 May 0100 UTC 26 May 0800 UTC 47/50 47/40 48/30 49/20 320 330 350 360 370 380 390 400 -
Y 25 May 0100 UTC 25 May 0800 UTC 46/50 47/40 49/30 51/20 320 330 340 350 360 370 380 390 400 -
Z 26 May 0100 UTC 26 May 0800 UTC 41/60 44/50 46/40 47/30 48/20 48/15 320 360 380 400 -
Z 25 May 0100 UTC 25 May 0800 UTC 45/50 46/40 48/30 50/20 320 330 340 350 360 370 380 390 400 -
Warning: Do not use this data for real-world aviation or navigation. No guarantee of current accuracy is given.