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 16 Oct 1130 UTC 16 Oct 1900 UTC RESNO 56/20 57/30 56/40 53/50 RIKAL 350 360 370 380 390
A 17 Oct 1130 UTC 17 Oct 1900 UTC DOGAL 55/20 56/30 56/40 55/50 LOMSI 350 360 370 380 390
B 16 Oct 1130 UTC 16 Oct 1900 UTC DOGAL 55/20 56/30 55/40 52/50 TUDEP 350 360 370 380 390
B 17 Oct 1130 UTC 17 Oct 1900 UTC MALOT 54/20 55/30 55/40 54/50 NEEKO 350 360 370 380 390
C 16 Oct 1130 UTC 16 Oct 1900 UTC NEBIN 5430/20 5530/30 5430/40 5130/50 UMESI 350 360 370 380 390
C 17 Oct 1130 UTC 17 Oct 1900 UTC TOBOR 5330/20 5430/30 5430/40 5330/50 PELTU 350 360 370 380 390
D 17 Oct 1130 UTC 17 Oct 1900 UTC LIMRI 53/20 54/30 54/40 53/50 RIKAL 350 360 370 380 390
D 16 Oct 1130 UTC 16 Oct 1900 UTC MALOT 54/20 55/30 54/40 51/50 ALLRY 350 360 370 380 390
E 17 Oct 1130 UTC 17 Oct 1900 UTC DINIM 52/20 53/30 53/40 52/50 TUDEP 350 360 370 380 390
T 16 Oct 0100 UTC 16 Oct 0800 UTC AVUTI 59/50 60/40 60/30 60/20 BALIX NINEX 320 340 360 380 400
U 16 Oct 0100 UTC 16 Oct 0800 UTC PORTI 47/50 48/40 49/30 51/20 DINIM ELSOX 320 330 340 350 360 370 380 390 400
V 16 Oct 0100 UTC 16 Oct 0800 UTC SUPRY 46/50 47/40 48/30 50/20 SOMAX ATSUR 320 330 340 350 360 370 380 390 400
W 16 Oct 0100 UTC 16 Oct 0800 UTC RAFIN 45/50 46/40 47/30 49/20 BEDRA NASBA 320 330 350 360 380 390 400
W 17 Oct 0100 UTC 17 Oct 0800 UTC SUPRY 46/50 48/40 50/30 51/20 DINIM ELSOX 320 330 340 350 360 370 380 390 400
X 16 Oct 0100 UTC 16 Oct 0800 UTC DOVEY 42/60 44/50 45/40 46/30 48/20 48/15 OMOKO GUNSO 320 330 350 360 380 390 400
X 17 Oct 0100 UTC 17 Oct 0800 UTC RAFIN 45/50 47/40 49/30 50/20 SOMAX ATSUR 320 330 340 350 360 370 380 390 400
Y 17 Oct 0100 UTC 17 Oct 0800 UTC DOVEY 42/60 44/50 46/40 48/30 49/20 BEDRA NASBA 320 330 350 360 380 390 400
Y 16 Oct 0100 UTC 16 Oct 0800 UTC JOBOC 41/60 40/50 40/40 350 370
Z 16 Oct 0100 UTC 16 Oct 0800 UTC SOORY 43/50 44/40 45/30 47/20 47/15 ETIKI REGHI 320 330 360 380 400
Z 17 Oct 0100 UTC 17 Oct 0800 UTC SOORY 43/50 45/40 47/30 48/20 48/15 OMOKO GUNSO 320 330 350 360 380 390 400
Warning: Do not use this data for real-world aviation or navigation. No guarantee of current accuracy is given.