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	02 Oct 1130 UTC	02 Oct 1900 UTC	BALIX 61/20 62/30 62/40 61/50 SAVRY		350 360 370
A	01 Oct 1130 UTC	01 Oct 1900 UTC	VALDI 66/10 67/20 67/30 66/40 64/50 KETLA		330 340 350 360
B	02 Oct 1130 UTC	02 Oct 1900 UTC	ERAKA 60/20 61/30 61/40 60/50 URTAK		350 360 370
B	01 Oct 1130 UTC	01 Oct 1900 UTC	SOSAR 66/20 66/30 65/40 63/50 PIDSO		330 340 350 360
C	02 Oct 1130 UTC	02 Oct 1900 UTC	GOMUP 59/20 60/30 60/40 59/50 AVUTI		350 360 370 380 390
C	01 Oct 1130 UTC	01 Oct 1900 UTC	SUNOT 57/20 56/30 54/40 52/50 TUDEP		340 350 360 370 380 390
D	01 Oct 1130 UTC	01 Oct 1900 UTC	BILTO 5630/20 5530/30 5330/40 5130/50 UMESI		350 360 370 380 390
D	02 Oct 1130 UTC	02 Oct 1900 UTC	SUNOT 58/20 59/30 59/40 58/50 DORYY		340 350 360 370 380 390
G	01 Oct 1130 UTC	01 Oct 1900 UTC	RESNO 55/20 54/30 52/40 50/50 ELSIR		340 350 360 370 380 390
R	02 Oct 0100 UTC	02 Oct 0800 UTC	RIKAL 53/50 55/40 55/30 56/20 PIKIL SOVED	340 350 360 370 380 390 400
S	02 Oct 0100 UTC	02 Oct 0800 UTC	TUDEP 52/50 54/40 54/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
T	02 Oct 0100 UTC	02 Oct 0800 UTC	UMESI 5130/50 5330/40 5330/30 5430/20 VENER KOKIB	350 360 370 380 390
U	02 Oct 0100 UTC	02 Oct 0800 UTC	ALLRY 51/50 53/40 53/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
V	02 Oct 0100 UTC	02 Oct 0800 UTC	BUDAR 5030/50 5230/40 5230/30 5330/20 NEBIN OLGON	350 360 370 380 390
W	02 Oct 0100 UTC	02 Oct 0800 UTC	ELSIR 50/50 52/40 52/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
X	02 Oct 0100 UTC	02 Oct 0800 UTC	IBERG 4930/50 5130/40 5130/30 5230/20 TOBOR RILED	350 360 370 380 390
Y	02 Oct 0100 UTC	02 Oct 0800 UTC	JOOPY 49/50 51/40 51/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
Z	02 Oct 0100 UTC	02 Oct 0800 UTC	NICSO 48/50 50/40 50/30 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