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 14 Oct 1130 UTC 14 Oct 1900 UTC BALIX 61/20 63/30 63/40 61/50 SAVRY 310 320 330 350 360 370
A 15 Oct 1130 UTC 15 Oct 1900 UTC ATSIX 61/20 62/30 61/40 59/50 AVUTI 310 320 330 350 360 370
B 15 Oct 1130 UTC 15 Oct 1900 UTC BALIX 60/20 61/30 60/40 58/50 DORYY 310 320 330 340 350 360 370
B 14 Oct 1130 UTC 14 Oct 1900 UTC ERAKA 60/20 62/30 62/40 60/50 URTAK 310 320 330 350 360 370
C 14 Oct 1130 UTC 14 Oct 1900 UTC GOMUP 59/20 61/30 60/40 58/50 CUDDY 310 320 330 340 350 360 370 380 390
C 15 Oct 1130 UTC 15 Oct 1900 UTC SUNOT 58/20 59/30 59/40 57/50 HOIST 310 320 330 340 350 360 370 380 390
D 15 Oct 1130 UTC 15 Oct 1900 UTC BILTO 5730/20 5830/30 5830/40 5630/50 IRLOK 350 360 370 380 390
D 14 Oct 1130 UTC 14 Oct 1900 UTC SUNOT 58/20 60/30 59/40 57/50 HOIST 310 320 330 340 350 360 370 380 390
E 14 Oct 1130 UTC 14 Oct 1900 UTC BILTO 5730/20 5930/30 5830/40 5630/50 IRLOK 350 360 370 380 390
F 15 Oct 1130 UTC 15 Oct 1900 UTC RESNO 56/20 57/30 57/40 55/50 LOMSI 310 320 330 340 350 360 370 380 390
S 15 Oct 0100 UTC 15 Oct 0800 UTC TUDEP 52/50 53/40 54/30 55/20 RESNO NETKI 320 330 340 350 360 370 380 390 400
S 14 Oct 0100 UTC 14 Oct 0800 UTC TUDEP 52/50 54/40 55/30 55/20 RESNO NETKI 320 330 340 350 360 370 380 390 400
T 15 Oct 0100 UTC 15 Oct 0800 UTC ALLRY 51/50 52/40 53/30 54/20 DOGAL BEXET 320 330 340 350 360 370 380 390 400
T 14 Oct 0100 UTC 14 Oct 0800 UTC ALLRY 51/50 53/40 54/30 54/20 DOGAL BEXET 320 330 340 350 360 370 380 390 400
U 15 Oct 0100 UTC 15 Oct 0800 UTC BUDAR 5030/50 5130/40 5230/30 5330/20 NEBIN OLGON 350 360 370 380 390
U 14 Oct 0100 UTC 14 Oct 0800 UTC ELSIR 50/50 52/40 53/30 53/20 MALOT GISTI 320 330 340 350 360 370 380 390 400
V 15 Oct 0100 UTC 15 Oct 0800 UTC ELSIR 50/50 51/40 52/30 53/20 MALOT GISTI 320 330 340 350 360 370 380 390 400
V 14 Oct 0100 UTC 14 Oct 0800 UTC JOOPY 49/50 51/40 52/30 52/20 LIMRI XETBO 320 330 340 350 360 370 380 390 400
W 15 Oct 0100 UTC 15 Oct 0800 UTC IBERG 4930/50 5030/40 5130/30 5230/20 TOBOR RILED 350 360 370 380 390
W 14 Oct 0100 UTC 14 Oct 0800 UTC NICSO 48/50 50/40 51/30 51/20 DINIM ELSOX 320 330 340 350 360 370 380 390 400
X 15 Oct 0100 UTC 15 Oct 0800 UTC JOOPY 49/50 50/40 51/30 52/20 LIMRI XETBO 320 330 340 350 360 370 380 390 400
X 14 Oct 0100 UTC 14 Oct 0800 UTC PORTI 47/50 49/40 50/30 50/20 SOMAX ATSUR 320 330 340 350 360 370 380 390 400
Y 15 Oct 0100 UTC 15 Oct 0800 UTC NICSO 48/50 49/40 50/30 51/20 DINIM ELSOX 320 330 340 350 360 370 380 390 400
Y 14 Oct 0100 UTC 14 Oct 0800 UTC DOVEY 42/60 44/50 48/40 49/30 49/20 BEDRA NASBA 320 360 380 400
Z 14 Oct 0100 UTC 14 Oct 0800 UTC SOORY 43/50 46/40 48/30 48/20 48/15 OMOKO GUNSO 320 360 380 400
Z 15 Oct 0100 UTC 15 Oct 0800 UTC PORTI 47/50 48/40 49/30 50/20 SOMAX ATSUR 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.