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 table 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	17 Oct 1130 UTC	17 Oct 1900 UTC	DOGAL 55/20 56/30 56/40 55/50 LOMSI		350 360 370 380 390
A	16 Oct 1130 UTC	16 Oct 1900 UTC	RESNO 56/20 57/30 56/40 53/50 RIKAL		350 360 370 380 390
B	17 Oct 1130 UTC	17 Oct 1900 UTC	MALOT 54/20 55/30 55/40 54/50 NEEKO		350 360 370 380 390
B	16 Oct 1130 UTC	16 Oct 1900 UTC	DOGAL 55/20 56/30 55/40 52/50 TUDEP		350 360 370 380 390
C	17 Oct 1130 UTC	17 Oct 1900 UTC	TOBOR 5330/20 5430/30 5430/40 5330/50 PELTU		350 360 370 380 390
C	16 Oct 1130 UTC	16 Oct 1900 UTC	NEBIN 5430/20 5530/30 5430/40 5130/50 UMESI		350 360 370 380 390
D	17 Oct 1130 UTC	17 Oct 1900 UTC	LIMRI 53/20 54/30 54/40 53/50 RIKAL		350 360 370 380 390
D	16 Oct 1130 UTC	16 Oct 1900 UTC	MALOT 54/20 55/30 54/40 51/50 ALLRY		350 360 370 380 390
E	17 Oct 1130 UTC	17 Oct 1900 UTC	DINIM 52/20 53/30 53/40 52/50 TUDEP		350 360 370 380 390
T	16 Oct 0100 UTC	16 Oct 0800 UTC	AVUTI 59/50 60/40 60/30 60/20 BALIX NINEX	320 340 360 380 400
U	16 Oct 0100 UTC	16 Oct 0800 UTC	PORTI 47/50 48/40 49/30 51/20 DINIM ELSOX	320 330 340 350 360 370 380 390 400
V	16 Oct 0100 UTC	16 Oct 0800 UTC	SUPRY 46/50 47/40 48/30 50/20 SOMAX ATSUR	320 330 340 350 360 370 380 390 400
W	16 Oct 0100 UTC	16 Oct 0800 UTC	RAFIN 45/50 46/40 47/30 49/20 BEDRA NASBA	320 330 350 360 380 390 400
W	17 Oct 0100 UTC	17 Oct 0800 UTC	SUPRY 46/50 48/40 50/30 51/20 DINIM ELSOX	320 330 340 350 360 370 380 390 400
X	16 Oct 0100 UTC	16 Oct 0800 UTC	DOVEY 42/60 44/50 45/40 46/30 48/20 48/15 OMOKO GUNSO	320 330 350 360 380 390 400
X	17 Oct 0100 UTC	17 Oct 0800 UTC	RAFIN 45/50 47/40 49/30 50/20 SOMAX ATSUR	320 330 340 350 360 370 380 390 400
Y	17 Oct 0100 UTC	17 Oct 0800 UTC	DOVEY 42/60 44/50 46/40 48/30 49/20 BEDRA NASBA	320 330 350 360 380 390 400
Y	16 Oct 0100 UTC	16 Oct 0800 UTC	JOBOC 41/60 40/50 40/40	350 370
Z	17 Oct 0100 UTC	17 Oct 0800 UTC	SOORY 43/50 45/40 47/30 48/20 48/15 OMOKO GUNSO	320 330 350 360 380 390 400
Z	16 Oct 0100 UTC	16 Oct 0800 UTC	SOORY 43/50 44/40 45/30 47/20 47/15 ETIKI REGHI	320 330 360 380 400

Pacific Organised Track System (PACOTS) tracks are daily high altitude pacific routes between eastern Asia and the western coast of North-America. Eastward tracks are named numerically (1,2,3...). Similarly, westward tracks are named incrementally from the beginning of the alphabet (A,B,C...). Daily updates for each direction allow for routing around weather systems and tracking of favourable tailwinds to improve efficiency. The table below shows the current valid PACOTS tracks and the upcoming published PACOTS tracks.

Track	Valid From	Valid To	Route