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	11 Dec 1130 UTC	11 Dec 1900 UTC	SUNOT 58/20 60/30 62/40 62/50 MAXAR		350 360 370 380 390
A	12 Dec 1130 UTC	12 Dec 1900 UTC	MALOT 52/20 51/30 48/40 45/50 RAFIN		350 360 370 390
B	12 Dec 1130 UTC	12 Dec 1900 UTC	LIMRI 51/20 50/30 47/40 44/50 BOBTU JAROM		350 360 370 390
C	11 Dec 1130 UTC	11 Dec 1900 UTC	LIMRI 51/20 50/30 48/40 46/50 SUPRY		350 360 370 390
C	12 Dec 1130 UTC	12 Dec 1900 UTC	DINIM 50/20 49/30 46/40 43/50 JEBBY CARAC		350 360 370 390
D	12 Dec 1130 UTC	12 Dec 1900 UTC	SOMAX 49/20 48/30 45/40 42/50 41/60 DOVEY		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
E	12 Dec 1130 UTC	12 Dec 1900 UTC	BEDRA 48/20 47/30 44/40 41/50 40/60 JOBOC		350 360 370 390
E	11 Dec 1130 UTC	11 Dec 1900 UTC	SOMAX 49/20 48/30 46/40 44/50 BOBTU JAROM		350 360 370 390
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	12 Dec 1130 UTC	12 Dec 1900 UTC	OMOKO 48/15 47/20 46/30 43/40 40/50 39/60 SLATN		350 360 370 390
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	12 Dec 0100 UTC	12 Dec 0800 UTC	LOMSI 55/50 56/40 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	12 Dec 0100 UTC	12 Dec 0800 UTC	NEEKO 54/50 55/40 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
W	12 Dec 0100 UTC	12 Dec 0800 UTC	RIKAL 53/50 54/40 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
X	12 Dec 0100 UTC	12 Dec 0800 UTC	TUDEP 52/50 53/40 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
Y	12 Dec 0100 UTC	12 Dec 0800 UTC	ALLRY 51/50 52/40 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
Z	12 Dec 0100 UTC	12 Dec 0800 UTC	ELSIR 50/50 51/40 51/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400

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