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	22 Jan 1130 UTC	22 Jan 1900 UTC	ERAKA 60/20 62/30 62/40 61/50 SAVRY		350 360 370
A	21 Jan 1130 UTC	21 Jan 1900 UTC	GOMUP 59/20 60/30 61/40 60/50 URTAK		350 360 370 380 390
B	22 Jan 1130 UTC	22 Jan 1900 UTC	GOMUP 59/20 61/30 61/40 60/50 URTAK		350 360 370 380 390
B	21 Jan 1130 UTC	21 Jan 1900 UTC	SUNOT 58/20 59/30 60/40 59/50 AVUTI		350 360 370 380 390
C	22 Jan 1130 UTC	22 Jan 1900 UTC	SUNOT 58/20 60/30 60/40 59/50 AVUTI		340 350 360 370 380 390
D	21 Jan 1130 UTC	21 Jan 1900 UTC	VENER 55/20 56/30 56/40 56/50 JANJO		340 350 360 370 380 390
E	21 Jan 1130 UTC	21 Jan 1900 UTC	NEBIN 54/20 55/30 55/40 55/50 LOMSI		340 350 360 370 380 390
R	21 Jan 0100 UTC	21 Jan 0800 UTC	ELSIR 50/50 53/40 54/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
S	21 Jan 0100 UTC	21 Jan 0800 UTC	JOOPY 49/50 52/40 53/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
S	22 Jan 0100 UTC	22 Jan 0800 UTC	ELSIR 50/50 52/40 54/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
T	21 Jan 0100 UTC	21 Jan 0800 UTC	NICSO 48/50 51/40 52/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
T	22 Jan 0100 UTC	22 Jan 0800 UTC	JOOPY 49/50 51/40 53/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
U	21 Jan 0100 UTC	21 Jan 0800 UTC	PORTI 47/50 50/40 51/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
U	22 Jan 0100 UTC	22 Jan 0800 UTC	NICSO 48/50 50/40 52/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
V	22 Jan 0100 UTC	22 Jan 0800 UTC	PORTI 47/50 49/40 51/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
V	21 Jan 0100 UTC	21 Jan 0800 UTC	SUPRY 46/50 49/40 50/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
W	22 Jan 0100 UTC	22 Jan 0800 UTC	SUPRY 46/50 48/40 50/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
W	21 Jan 0100 UTC	21 Jan 0800 UTC	RAFIN 45/50 48/40 49/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
X	22 Jan 0100 UTC	22 Jan 0800 UTC	RAFIN 45/50 47/40 49/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
X	21 Jan 0100 UTC	21 Jan 0800 UTC	DOVEY 42/60 44/50 47/40 48/30 49/20 BEDRA NASBA	340 350 370 380 390 400
Y	22 Jan 0100 UTC	22 Jan 0800 UTC	DOVEY 42/60 44/50 46/40 48/30 49/20 BEDRA NASBA	340 350 370 380 390 400
Y	21 Jan 0100 UTC	21 Jan 0800 UTC	JOBOC 41/60 43/50 46/40 47/30 48/20 48/15 OMOKO GUNSO	340 350 370 380 390 400
Z	22 Jan 0100 UTC	22 Jan 0800 UTC	SOORY 42/50 45/40 47/30 48/20 48/15 OMOKO GUNSO	340 350 370 380 390 400
Z	21 Jan 0100 UTC	21 Jan 0800 UTC	SOORY 42/50 45/40 46/30 47/20 47/15 ETIKI REGHI	340 350 370 380 390 400