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	31 Mar 1130 UTC	31 Mar 1900 UTC	GOMUP 58/15 58/20 58/30 57/40 56/50 JANJO		340 350 360 370 380 390
A	30 Mar 1130 UTC	30 Mar 1900 UTC	SUNOT 57/20 57/30 56/40 54/50 NEEKO		340 350 360 370 380 390
B	31 Mar 1130 UTC	31 Mar 1900 UTC	SUNOT 57/20 57/30 56/40 55/50 LOMSI		340 350 360 370 380 390
B	30 Mar 1130 UTC	30 Mar 1900 UTC	BILTO 5630/20 5630/30 5530/40 5330/50 PELTU		350 360 370 380 390
D	31 Mar 1130 UTC	31 Mar 1900 UTC	RESNO 55/20 55/30 54/40 53/50 RIKAL		340 350 360 370 380 390
E	31 Mar 1130 UTC	31 Mar 1900 UTC	DOGAL 54/20 54/30 53/40 52/50 TUDEP		340 350 360 370 380 390
E	30 Mar 1130 UTC	30 Mar 1900 UTC	RESNO 55/20 55/30 54/40 52/50 TUDEP		340 350 360 370 380 390
Q	01 Apr 0100 UTC	01 Apr 0800 UTC	ELSIR 50/50 52/40 53/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
R	01 Apr 0100 UTC	01 Apr 0800 UTC	JOOPY 49/50 51/40 52/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
S	01 Apr 0100 UTC	01 Apr 0800 UTC	NICSO 48/50 50/40 51/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
T	01 Apr 0100 UTC	01 Apr 0800 UTC	PORTI 47/50 49/40 50/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
U	31 Mar 0100 UTC	31 Mar 0800 UTC	SUPRY 46/50 48/40 49/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
U	01 Apr 0100 UTC	01 Apr 0800 UTC	SUPRY 46/50 48/40 49/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
V	31 Mar 0100 UTC	31 Mar 0800 UTC	RAFIN 45/50 47/40 48/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
V	01 Apr 0100 UTC	01 Apr 0800 UTC	RAFIN 45/50 47/40 48/30 49/20 BEDRA NASBA	350 360 380 390 400
W	31 Mar 0100 UTC	31 Mar 0800 UTC	DOVEY 42/60 44/50 46/40 47/30 49/20 BEDRA NASBA	350 360 380 390 400
W	01 Apr 0100 UTC	01 Apr 0800 UTC	DOVEY 42/60 44/50 46/40 47/30 48/20 48/15 OMOKO GUNSO	350 360 380 390 400
X	31 Mar 0100 UTC	31 Mar 0800 UTC	JOBOC 41/60 43/50 45/40 46/30 48/20 48/15 ETIKI REGHI	350 360 380 390 400
X	01 Apr 0100 UTC	01 Apr 0800 UTC	JOBOC 41/60 43/50 45/40 46/30 47/20 47/15 ETIKI REGHI	350 360 380 390 400
Y	01 Apr 0100 UTC	01 Apr 0800 UTC	SLATN 40/60 41/50 43/40	350 370 390
Y	31 Mar 0100 UTC	31 Mar 0800 UTC	SLATN 40/60 42/50 43/40	350 370
Z	31 Mar 0100 UTC	31 Mar 0800 UTC	36/60 40/50 44/40 45/30 47/20 47/15 SEPAL LAPEX	360 380 390 400
Z	01 Apr 0100 UTC	01 Apr 0800 UTC	SOORY 42/50 44/40 45/30 46/20 46/15 SEPAL LAPEX	360 380 400