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 27 Jun 1130 UTC 27 Jun 1900 UTC 59/20 61/30 61/40 61/50 - 310 320 330 350 360 370 380 390
A 28 Jun 1130 UTC 28 Jun 1900 UTC 61/20 63/30 63/40 62/50 - 310 320 330 350 360 370
B 27 Jun 1130 UTC 27 Jun 1900 UTC 58/20 60/30 60/40 60/50 - 310 320 330 350 360 370 380 390
B 28 Jun 1130 UTC 28 Jun 1900 UTC 60/20 62/30 62/40 61/50 - 310 320 330 350 360 370
C 27 Jun 1130 UTC 27 Jun 1900 UTC 57/20 59/30 59/40 59/50 - 310 320 330 350 360 370 380 390
C 28 Jun 1130 UTC 28 Jun 1900 UTC 59/20 61/30 61/40 60/50 - 310 320 330 350 360 370 380 390
D 27 Jun 1130 UTC 27 Jun 1900 UTC 56/20 58/30 58/40 58/50 - 310 320 330 340 350 360 370 380 390
D 28 Jun 1130 UTC 28 Jun 1900 UTC 58/20 60/30 60/40 59/50 - 310 320 330 350 360 370 380 390
E 27 Jun 1130 UTC 27 Jun 1900 UTC 55/20 57/30 57/40 57/50 - 310 320 330 340 350 360 370 380 390
E 28 Jun 1130 UTC 28 Jun 1900 UTC 57/20 59/30 59/40 58/50 - 310 320 330 340 350 360 370 380 390
F 27 Jun 1130 UTC 27 Jun 1900 UTC 54/20 56/30 56/40 56/50 - 310 320 330 340 350 360 370 380 390
F 28 Jun 1130 UTC 28 Jun 1900 UTC 56/20 58/30 58/40 57/50 - 310 320 330 340 350 360 370 380 390
G 27 Jun 1130 UTC 27 Jun 1900 UTC 42/40 40/50 40/60 - 320 340 360 380
H 27 Jun 1130 UTC 27 Jun 1900 UTC 39/40 37/50 34/60 - 320 340 360 380
U 29 Jun 0100 UTC 29 Jun 0800 UTC 54/50 55/40 55/30 54/20 320 330 340 350 360 370 380 390 400 -
U 28 Jun 0100 UTC 28 Jun 0800 UTC 52/50 53/40 54/30 54/20 320 330 340 350 360 370 380 390 400 -
V 29 Jun 0100 UTC 29 Jun 0800 UTC 53/50 54/40 54/30 53/20 320 330 340 350 360 370 380 390 400 -
V 28 Jun 0100 UTC 28 Jun 0800 UTC 51/50 52/40 53/30 53/20 320 330 340 350 360 370 380 390 400 -
W 29 Jun 0100 UTC 29 Jun 0800 UTC 52/50 53/40 53/30 52/20 320 330 340 350 360 370 380 390 400 -
W 28 Jun 0100 UTC 28 Jun 0800 UTC 5030/50 5130/40 5230/30 5230/20 350 360 370 380 390 -
X 29 Jun 0100 UTC 29 Jun 0800 UTC 5130/50 5230/40 5230/30 5130/20 350 360 370 380 390 -
X 28 Jun 0100 UTC 28 Jun 0800 UTC 50/50 51/40 52/30 52/20 320 330 340 350 360 370 380 390 400 -
Y 29 Jun 0100 UTC 29 Jun 0800 UTC 51/50 52/40 52/30 51/20 320 330 340 350 360 370 380 390 400 -
Y 28 Jun 0100 UTC 28 Jun 0800 UTC 49/50 50/40 51/30 51/20 320 330 340 350 360 370 380 390 400 -
Z 29 Jun 0100 UTC 29 Jun 0800 UTC 50/50 51/40 51/30 50/20 320 330 340 350 360 370 380 390 400 -
Z 28 Jun 0100 UTC 28 Jun 0800 UTC 48/50 49/40 50/30 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.