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 Sep 1130 UTC 21 Sep 1900 UTC 58/15 59/20 59/30 59/40 57/50 HOIST 310 320 330 340 350 360 370 380 390
A 20 Sep 1130 UTC 20 Sep 1900 UTC BALIX 60/15 60/20 60/30 60/40 59/50 AVUTI 310 320 330 350 360 370
B 21 Sep 1130 UTC 21 Sep 1900 UTC 57/20 58/30 58/40 56/50 JANJO 310 320 330 340 350 360 370 380 390
B 20 Sep 1130 UTC 20 Sep 1900 UTC 58/15 59/20 59/30 59/40 58/50 DORYY 310 320 330 340 350 360 370 380 390
C 20 Sep 1130 UTC 20 Sep 1900 UTC 57/20 58/30 58/40 57/50 HOIST 310 320 330 340 350 360 370 380 390
D 21 Sep 1130 UTC 21 Sep 1900 UTC 55/20 56/30 56/40 54/50 NEEKO 310 320 330 340 350 360 370 380 390
E 21 Sep 1130 UTC 21 Sep 1900 UTC NEBIN 54/20 55/30 55/40 53/50 RIKAL 310 320 330 340 350 360 370 380 390
E 20 Sep 1130 UTC 20 Sep 1900 UTC 55/20 56/30 56/40 55/50 LOMSI 310 320 330 340 350 360 370 380 390
R 21 Sep 0100 UTC 21 Sep 0800 UTC ELSIR 50/50 52/40 53/30 54/20 BEXET 320 330 340 350 360 370 380 390 400
S 20 Sep 0100 UTC 20 Sep 0800 UTC ALLRY 51/50 52/40 53/30 53/20 MALOT GISTI 320 330 340 350 360 370 380 390 400
S 21 Sep 0100 UTC 21 Sep 0800 UTC JOOPY 49/50 51/40 52/30 53/20 MALOT GISTI 320 330 340 350 360 370 380 390 400
T 21 Sep 0100 UTC 21 Sep 0800 UTC NICSO 48/50 50/40 51/30 52/20 LIMRI XETBO 320 330 340 350 360 370 380 390 400
T 20 Sep 0100 UTC 20 Sep 0800 UTC ELSIR 50/50 51/40 52/30 52/20 LIMRI XETBO 320 330 340 350 360 370 380 390 400
U 21 Sep 0100 UTC 21 Sep 0800 UTC OMSAT 4730/50 4930/40 5030/30 5130/20 ADARA LEKVA 350 360 370 380 390
U 20 Sep 0100 UTC 20 Sep 0800 UTC JOOPY 49/50 50/40 51/30 51/20 320 330 340 350 360 370 380 390 400
V 21 Sep 0100 UTC 21 Sep 0800 UTC PORTI 47/50 49/40 50/30 51/20 320 330 340 350 360 370 380 390 400
V 20 Sep 0100 UTC 20 Sep 0800 UTC MUSAK 4830/50 4930/40 5030/30 5030/20 350 360 370 380 390
W 20 Sep 0100 UTC 20 Sep 0800 UTC NICSO 48/50 49/40 50/30 50/20 320 330 340 350 360 370 380 390 400
W 21 Sep 0100 UTC 21 Sep 0800 UTC SUPRY 46/50 48/40 49/30 50/20 320 330 340 350 360 370 380 390 400
X 20 Sep 0100 UTC 20 Sep 0800 UTC PORTI 47/50 48/40 49/30 49/20 320 330 350 360 380 390 400
X 21 Sep 0100 UTC 21 Sep 0800 UTC RAFIN 45/50 47/40 48/30 49/20 320 330 350 360 370 380 390 400
Y 21 Sep 0100 UTC 21 Sep 0800 UTC DOVEY 42/60 44/50 46/40 47/30 48/20 48/15 OMOKO 320 360 380 400
Y 20 Sep 0100 UTC 20 Sep 0800 UTC SUPRY 46/50 47/40 48/30 48/20 48/15 OMOKO 320 330 350 360 380 390 400
Z 21 Sep 0100 UTC 21 Sep 0800 UTC 40/60 43/50 45/40 46/30 47/20 47/15 SEPAL LAPEX 320 360 380 400
Z 20 Sep 0100 UTC 20 Sep 0800 UTC SOORY 44/50 45/40 46/30 47/20 47/15 ETIKI REGHI 320 360 380 400
Warning: Do not use this data for real-world aviation or navigation. No guarantee of current accuracy is given.