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	27 Jul 1130 UTC	27 Jul 1900 UTC	61/20 62/30 61/40 59/50	-	310 320 330 350 360 370
A	28 Jul 1130 UTC	28 Jul 1900 UTC	62/20 63/30 62/40 60/50	-	310 320 330 350 360 370
B	27 Jul 1130 UTC	27 Jul 1900 UTC	60/20 61/30 60/40 58/50	-	310 320 330 340 350 360 370
B	28 Jul 1130 UTC	28 Jul 1900 UTC	61/20 62/30 61/40 59/50	-	310 320 330 350 360 370
C	27 Jul 1130 UTC	27 Jul 1900 UTC	59/20 60/30 59/40 57/50	-	310 320 330 340 350 360 370 380 390
C	28 Jul 1130 UTC	28 Jul 1900 UTC	60/20 61/30 60/40 58/50	-	310 320 330 340 350 360 370
D	27 Jul 1130 UTC	27 Jul 1900 UTC	58/20 59/30 58/40 56/50	-	310 320 330 340 350 360 370 380 390
D	28 Jul 1130 UTC	28 Jul 1900 UTC	57/20 58/30 57/40 55/50	-	310 320 330 340 350 360 370 380 390
E	27 Jul 1130 UTC	27 Jul 1900 UTC	57/20 58/30 57/40 55/50	-	310 320 330 340 350 360 370 380 390
E	28 Jul 1130 UTC	28 Jul 1900 UTC	56/20 57/30 56/40 54/50	-	310 320 330 340 350 360 370 380 390
F	27 Jul 1130 UTC	27 Jul 1900 UTC	5630/20 5730/30 5630/40 5430/50	-	350 360 370 380 390
F	28 Jul 1130 UTC	28 Jul 1900 UTC	5530/20 5630/30 5530/40 5330/50	-	350 360 370 380 390
G	27 Jul 1130 UTC	27 Jul 1900 UTC	56/20 57/30 56/40 54/50	-	310 320 330 340 350 360 370 380 390
G	28 Jul 1130 UTC	28 Jul 1900 UTC	55/20 56/30 55/40 53/50	-	310 320 330 340 350 360 370 380 390
H	28 Jul 1130 UTC	28 Jul 1900 UTC	54/20 55/30 54/40 52/50	-	310 320 330 340 350 360 370 380 390
R	27 Jul 0100 UTC	27 Jul 0800 UTC	50/50 51/40 52/30 53/20	320 330 340 350 360 370 380 390 400	-
R	28 Jul 0100 UTC	28 Jul 0800 UTC	50/50 51/40 52/30 53/20	320 330 340 350 360 370 380 390 400	-
S	27 Jul 0100 UTC	27 Jul 0800 UTC	49/50 50/40 51/30 52/20	320 330 340 350 360 370 380 390 400	-
S	28 Jul 0100 UTC	28 Jul 0800 UTC	49/50 50/40 51/30 52/20	320 330 340 350 360 370 380 390 400	-
T	27 Jul 0100 UTC	27 Jul 0800 UTC	4830/50 4930/40 5030/30 5130/20	350 360 370 380 390	-
T	28 Jul 0100 UTC	28 Jul 0800 UTC	4830/50 4930/40 5030/30 5130/20	350 360 370 380 390	-
U	27 Jul 0100 UTC	27 Jul 0800 UTC	48/50 49/40 50/30 51/20	320 330 340 350 360 370 380 390 400	-
U	28 Jul 0100 UTC	28 Jul 0800 UTC	48/50 49/40 50/30 51/20	320 330 340 350 360 370 380 390 400	-
V	27 Jul 0100 UTC	27 Jul 0800 UTC	47/50 48/40 49/30 50/20	320 330 340 350 360 370 380 390 400	-
V	28 Jul 0100 UTC	28 Jul 0800 UTC	47/50 48/40 49/30 50/20	320 330 340 350 360 370 380 390 400	-
W	27 Jul 0100 UTC	27 Jul 0800 UTC	46/50 47/40 48/30 49/20	320 330 350 360 380 390 400	-
W	28 Jul 0100 UTC	28 Jul 0800 UTC	46/50 47/40 48/30 49/20	320 330 350 360 380 390 400	-
X	27 Jul 0100 UTC	27 Jul 0800 UTC	42/60 44/50 46/40 47/30 48/20 48/15	310 320 340 360 380 400	-
X	27 Jul 0100 UTC	27 Jul 0800 UTC	42/60 44/50 46/40 47/30 48/20 48/15	320 360 380 400	-
X	28 Jul 0100 UTC	28 Jul 0800 UTC	41/60 44/50 46/40 47/30 48/20 48/15	320 360 380 400	-
Y	27 Jul 0100 UTC	27 Jul 0800 UTC	41/60 43/50 45/40 46/30 47/20 47/15	310 320 340 360 380 400	-
Y	27 Jul 0100 UTC	27 Jul 0800 UTC	41/60 43/50 45/40 46/30 47/20 47/15	320 360 380 400	-
Y	28 Jul 0100 UTC	28 Jul 0800 UTC	36/60 41/50 45/40 46/30 47/20 47/15	320 360 380 400	-
Z	27 Jul 0100 UTC	27 Jul 0800 UTC	42/50 44/40 44/30 46/20 46/15	310 320 340 360 380 400	-
Z	27 Jul 0100 UTC	27 Jul 0800 UTC	42/50 44/40 44/30 46/20 46/15	320 360 380 400	-
Z	28 Jul 0100 UTC	28 Jul 0800 UTC	38/50 43/40 45/30 46/20 46/15	320 360 380 400	-

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
1	28 Jul 0700 UTC	28 Jul 2100 UTC	55N160W 54N150W 52N140W
11	28 Jul 1000 UTC	28 Jul 2100 UTC	35N150E 32N160E 31N170E 29N180E 26N170W
14	28 Jul 0700 UTC	28 Jul 2100 UTC	42N160E 44N170E 46N180E 47N170W 46N160W 44N150W 42N140W 38N130W
2	28 Jul 0700 UTC	28 Jul 2100 UTC	44N160E 46N170E 48N180E 49N170W 48N160W 46N150W 45N140W 42N130W
3	28 Jul 0700 UTC	28 Jul 2100 UTC	43N160E 45N170E 47N180E 48N170W 47N160W 45N150W 43N140W 40N130W
8	28 Jul 0700 UTC	28 Jul 2100 UTC	55N160W 54N150W 52N140W
A	27 Jul 1900 UTC	28 Jul 0800 UTC	27N170W 32N180E 35N170E 36N160E 35N150E
C	27 Jul 1900 UTC	28 Jul 0800 UTC	57N160W 54N180E
E	27 Jul 1900 UTC	28 Jul 0800 UTC	40N140W 41N150W 42N160W 41N170W 41N180E 40N170E 39N160E
F	27 Jul 1900 UTC	28 Jul 0800 UTC	39N140W 40N150W 41N160W 40N170W 40N180E 39N170E 38N160E 36N150E
J	28 Jul 0500 UTC	28 Jul 2100 UTC	40N140W 41N150W 41N160W 40N170W 39N180E 38N170E 36N160E 33N150E
K	28 Jul 0500 UTC	28 Jul 2100 UTC	36N130W 37N140W 39N150W 40N160W 39N170W 38N180E 37N170E 35N160E 32N150E 28N140E
M	27 Jul 1900 UTC	28 Jul 0800 UTC	41N130W 42N140W 43N150W 43N160W 42N170W 42N180E 41N170E 40N160E