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 22 Jan 1130 UTC 22 Jan 1900 UTC 50/20 49/30 49/40 48/50 NICSO 310 320 330 350 360 370 390
B 22 Jan 1130 UTC 22 Jan 1900 UTC 49/20 48/30 48/40 47/50 PORTI 310 320 330 350 360 370 390
C 22 Jan 1130 UTC 22 Jan 1900 UTC 48/20 47/30 47/40 46/50 SUPRY 310 320 330 350 360 370 390
D 22 Jan 1130 UTC 22 Jan 1900 UTC OMOKO 48/15 47/20 46/30 46/40 45/50 RAFIN 310 320 330 350 360 370 390
E 22 Jan 1130 UTC 22 Jan 1900 UTC ETIKI 47/15 46/20 45/30 45/40 44/50 BOBTU JAROM 310 320 330 350 360 370 390
F 22 Jan 1130 UTC 22 Jan 1900 UTC 44/40 43/50 JEBBY CARAC 320 340 360 380
G 22 Jan 1130 UTC 22 Jan 1900 UTC 42/40 40/50 SOORY 320 340 360 380
H 22 Jan 1130 UTC 22 Jan 1900 UTC 40/40 38/50 34/60 320 340 360 380
Q 23 Jan 0100 UTC 23 Jan 0800 UTC DORYY 58/50 59/40 60/30 60/20 ERAKA ETSOM 320 330 340 350 360 370 380 390 400
R 22 Jan 0100 UTC 22 Jan 0800 UTC DORYY 58/50 59/40 59/30 58/20 320 330 340 350 360 370 380 390 400
S 23 Jan 0100 UTC 23 Jan 0800 UTC JANJO 56/50 57/40 58/30 58/20 320 330 340 350 360 370 380 390 400
U 22 Jan 0100 UTC 22 Jan 0800 UTC JANJO 56/50 57/40 57/30 56/20 320 330 340 350 360 370 380 390 400
V 22 Jan 0100 UTC 22 Jan 0800 UTC LOMSI 55/50 56/40 56/30 55/20 BEXET 320 330 340 350 360 370 380 390 400
V 23 Jan 0100 UTC 23 Jan 0800 UTC NEEKO 54/50 55/40 56/30 56/20 320 330 340 350 360 370 380 390 400
W 22 Jan 0100 UTC 22 Jan 0800 UTC NEEKO 54/50 55/40 55/30 54/20 MALOT GISTI 320 330 340 350 360 370 380 390 400
W 23 Jan 0100 UTC 23 Jan 0800 UTC RIKAL 53/50 54/40 55/30 55/20 BEXET 320 330 340 350 360 370 380 390 400
X 23 Jan 0100 UTC 23 Jan 0800 UTC TUDEP 52/50 53/40 54/30 54/20 MALOT GISTI 320 330 340 350 360 370 380 390 400
X 22 Jan 0100 UTC 22 Jan 0800 UTC RIKAL 53/50 54/40 54/30 53/20 LIMRI XETBO 320 330 340 350 360 370 380 390 400
Y 23 Jan 0100 UTC 23 Jan 0800 UTC SOORY 43/50 48/40 51/30 51/20 320 400
Y 22 Jan 0100 UTC 22 Jan 0800 UTC TUDEP 52/50 53/40 53/30 52/20 320 330 340 350 360 370 380 390 400
Z 23 Jan 0100 UTC 23 Jan 0800 UTC 36/50 43/40 48/30 50/20 320 400
Z 22 Jan 0100 UTC 22 Jan 0800 UTC SOORY 44/50 47/40 49/30 49/20 320 360 400
Warning: Do not use this data for real-world aviation or navigation. No guarantee of current accuracy is given.