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 Nov 1130 UTC	27 Nov 1900 UTC	GOMUP 58/15 58/20 58/30 58/40 57/50 HOIST		340 350 360 370 380 390
A	26 Nov 1130 UTC	26 Nov 1900 UTC	ERAKA 59/20 59/30 58/40 56/50 JANJO		340 360 370
B	27 Nov 1130 UTC	27 Nov 1900 UTC	SUNOT 57/20 57/30 57/40 56/50 JANJO		340 350 360 370 380 390
B	26 Nov 1130 UTC	26 Nov 1900 UTC	GOMUP 58/20 58/30 57/40 55/50 LOMSI		340 360 370 380 390
D	27 Nov 1130 UTC	27 Nov 1900 UTC	DINIM 52/20 53/30 53/40 52/50 TUDEP		340 350 360 370 380 390
D	26 Nov 1130 UTC	26 Nov 1900 UTC	RESNO 55/20 55/30 53/40 51/50 ALLRY		340 350 360 370 380 390
E	27 Nov 1130 UTC	27 Nov 1900 UTC	SOMAX 51/20 52/30 52/40 51/50 ALLRY		340 350 360 370 380 390
E	26 Nov 1130 UTC	26 Nov 1900 UTC	DOGAL 54/20 54/30 52/40 50/50 ELSIR		340 350 360 370 380 390
F	27 Nov 1130 UTC	27 Nov 1900 UTC	BEDRA 50/20 51/30 51/40 50/50 ELSIR		340 350 360 370 380 390
S	27 Nov 0100 UTC	27 Nov 0800 UTC	JOOPY 49/50 51/40 52/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
T	27 Nov 0100 UTC	27 Nov 0800 UTC	NICSO 48/50 50/40 51/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
T	26 Nov 0100 UTC	26 Nov 0800 UTC	LOMSI 55/50 56/40 56/30 55/20 RESNO NETKI	340 360 380 400
U	27 Nov 0100 UTC	27 Nov 0800 UTC	PORTI 47/50 49/40 50/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
U	26 Nov 0100 UTC	26 Nov 0800 UTC	NEEKO 54/50 55/40 55/30 54/20 DOGAL BEXET	340 360 380 400
V	27 Nov 0100 UTC	27 Nov 0800 UTC	SUPRY 46/50 48/40 49/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
V	26 Nov 0100 UTC	26 Nov 0800 UTC	RAFIN 45/50 46/40 49/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
W	27 Nov 0100 UTC	27 Nov 0800 UTC	RAFIN 45/50 47/40 48/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
W	26 Nov 0100 UTC	26 Nov 0800 UTC	DOVEY 42/60 44/50 45/40 48/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
X	27 Nov 0100 UTC	27 Nov 0800 UTC	DOVEY 42/60 44/50 46/40 47/30 49/20 BEDRA NASBA	360 380 400
X	26 Nov 0100 UTC	26 Nov 0800 UTC	JOBOC 41/60 43/50 44/40 47/30 49/20 BEDRA NASBA	350 360 380 390 400
Y	27 Nov 0100 UTC	27 Nov 0800 UTC	JOBOC 41/60 43/50 45/40 46/30 48/20 48/15 OMOKO GUNSO	360 380 400
Y	26 Nov 0100 UTC	26 Nov 0800 UTC	SLATN 41/50 42/40	350 370
Z	27 Nov 0100 UTC	27 Nov 0800 UTC	SOORY 42/50 44/40 45/30 47/20 47/15 ETIKI REGHI	360 380 400
Z	26 Nov 0100 UTC	26 Nov 0800 UTC	SOORY 42/50 43/40 46/30 48/20 48/15 OMOKO GUNSO	360 380 390 400