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	11 Dec 1130 UTC	11 Dec 1900 UTC	SUNOT 58/20 60/30 62/40 62/50 MAXAR		350 360 370 380 390
B	10 Dec 1130 UTC	10 Dec 1900 UTC	RESNO 56/20 58/30 59/40 58/50 CUDDY		340 350 360 370 380 390
C	10 Dec 1130 UTC	10 Dec 1900 UTC	DOGAL 55/20 57/30 58/40 57/50 HOIST		340 350 360 370 380 390
C	11 Dec 1130 UTC	11 Dec 1900 UTC	LIMRI 51/20 50/30 48/40 46/50 SUPRY		350 360 370 390
D	11 Dec 1130 UTC	11 Dec 1900 UTC	DINIM 50/20 49/30 47/40 45/50 RAFIN		350 360 370 390
D	10 Dec 1130 UTC	10 Dec 1900 UTC	MALOT 54/20 56/30 57/40 56/50 JANJO		340 350 360 370 380 390
E	11 Dec 1130 UTC	11 Dec 1900 UTC	SOMAX 49/20 48/30 46/40 44/50 BOBTU JAROM		350 360 370 390
E	10 Dec 1130 UTC	10 Dec 1900 UTC	LIMRI 53/20 55/30 56/40 55/50 LOMSI		340 350 360 370 380 390
F	11 Dec 1130 UTC	11 Dec 1900 UTC	BEDRA 48/20 47/30 45/40 43/50 42/60 DOVEY		350 360 370 390
F	10 Dec 1130 UTC	10 Dec 1900 UTC	DINIM 52/20 54/30 55/40 54/50 NEEKO		340 350 360 370 380 390
G	11 Dec 1130 UTC	11 Dec 1900 UTC	ETIKI 48/15 47/20 46/30 44/40 42/50 40/60 SLATN		350 360 370 390
S	11 Dec 0100 UTC	11 Dec 0800 UTC	NEEKO 54/50 56/40 57/30 57/20 SUNOT KESIX	340 350 360 370 380 390 400
T	11 Dec 0100 UTC	11 Dec 0800 UTC	RIKAL 53/50 55/40 56/30 56/20 PIKIL SOVED	340 350 360 370 380 390 400
U	11 Dec 0100 UTC	11 Dec 0800 UTC	TUDEP 52/50 54/40 55/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
V	11 Dec 0100 UTC	11 Dec 0800 UTC	UMESI 5130/50 5330/40 5430/30 5430/20 VENER KOKIB	350 360 370 380 390
W	11 Dec 0100 UTC	11 Dec 0800 UTC	ALLRY 51/50 53/40 54/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
X	11 Dec 0100 UTC	11 Dec 0800 UTC	ELSIR 50/50 52/40 53/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
Y	11 Dec 0100 UTC	11 Dec 0800 UTC	JOOPY 49/50 51/40 52/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
Z	11 Dec 0100 UTC	11 Dec 0800 UTC	SOORY 44/50 47/40 49/30 51/20 DINIM ELSOX	360 380 400