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 Apr 1130 UTC	27 Apr 1900 UTC	GOMUP 59/20 60/30 60/40 58/50 DORYY		340 350 360 370 380 390
A	26 Apr 1130 UTC	26 Apr 1900 UTC	GOMUP 59/20 60/30 60/40 60/50 URTAK		350 360 370 380 390
B	27 Apr 1130 UTC	27 Apr 1900 UTC	SUNOT 58/20 59/30 59/40 57/50 HOIST		340 350 360 370 380 390
B	26 Apr 1130 UTC	26 Apr 1900 UTC	SUNOT 58/20 59/30 59/40 59/50 AVUTI		350 360 370 380 390
D	27 Apr 1130 UTC	27 Apr 1900 UTC	RESNO 56/20 57/30 57/40 55/50 LOMSI		340 350 360 370 380 390
D	26 Apr 1130 UTC	26 Apr 1900 UTC	RESNO 56/20 57/30 57/40 57/50 HOIST		340 350 360 370 380 390
E	27 Apr 1130 UTC	27 Apr 1900 UTC	DOGAL 55/20 56/30 56/40 54/50 NEEKO		340 350 360 370 380 390
E	26 Apr 1130 UTC	26 Apr 1900 UTC	DOGAL 55/20 56/30 56/40 56/50 JANJO		340 350 360 370 380 390
F	26 Apr 1130 UTC	26 Apr 1900 UTC	MALOT 54/20 55/30 55/40 55/50 LOMSI		340 350 360 370 380 390
F	27 Apr 1130 UTC	27 Apr 1900 UTC	45/40 44/50 BOBTU JAROM		350 370 380
G	27 Apr 1130 UTC	27 Apr 1900 UTC	44/40 43/50 41/60 SLATN		350 370 380
T	27 Apr 0100 UTC	27 Apr 0800 UTC	ALLRY 51/50 53/40 55/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
U	27 Apr 0100 UTC	27 Apr 0800 UTC	BUDAR 5030/50 5230/40 5430/30 5430/20 VENER KOKIB	350 360 370 380 390
V	27 Apr 0100 UTC	27 Apr 0800 UTC	ELSIR 50/50 52/40 54/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
W	27 Apr 0100 UTC	27 Apr 0800 UTC	JOOPY 49/50 51/40 53/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
X	27 Apr 0100 UTC	27 Apr 0800 UTC	NICSO 48/50 50/40 52/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
Y	27 Apr 0100 UTC	27 Apr 0800 UTC	PORTI 47/50 49/40 51/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
Z	27 Apr 0100 UTC	27 Apr 0800 UTC	SUPRY 46/50 48/40 50/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400