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	20 Sep 1130 UTC	20 Sep 1900 UTC	61/20 63/30 63/40 62/50	-	310 320 330 350 360 370
A	21 Sep 1130 UTC	21 Sep 1900 UTC	61/20 62/30 61/40 59/50	-	310 320 330 350 360 370
B	20 Sep 1130 UTC	20 Sep 1900 UTC	60/20 62/30 62/40 61/50	-	310 320 330 350 360 370
B	21 Sep 1130 UTC	21 Sep 1900 UTC	60/20 61/30 60/40 58/50	-	310 320 330 340 350 360 370
C	20 Sep 1130 UTC	20 Sep 1900 UTC	59/20 61/30 61/40 60/50	-	310 320 330 350 360 370 380 390
C	21 Sep 1130 UTC	21 Sep 1900 UTC	59/20 60/30 59/40 57/50	-	310 320 330 340 350 360 370 380 390
D	20 Sep 1130 UTC	20 Sep 1900 UTC	55/20 53/30 50/40 47/50	-	310 320 330 350 360 370 390
D	21 Sep 1130 UTC	21 Sep 1900 UTC	58/20 59/30 58/40 56/50	-	310 320 330 340 350 360 370 380 390
E	20 Sep 1130 UTC	20 Sep 1900 UTC	54/20 52/30 49/40 46/50	-	310 320 330 350 360 370 390
E	21 Sep 1130 UTC	21 Sep 1900 UTC	5730/20 5830/30 5730/40 5530/50	-	350 360 370 380 390
F	20 Sep 1130 UTC	20 Sep 1900 UTC	53/20 51/30 48/40 45/50	-	310 320 330 350 360 370 390
F	21 Sep 1130 UTC	21 Sep 1900 UTC	57/20 58/30 57/40 55/50	-	310 320 330 340 350 360 370 380 390
G	20 Sep 1130 UTC	20 Sep 1900 UTC	52/20 50/30 47/40 44/50	-	310 320 330 350 360 370 390
G	21 Sep 1130 UTC	21 Sep 1900 UTC	56/20 57/30 56/40 54/50	-	310 320 330 340 350 360 370 380 390
H	20 Sep 1130 UTC	20 Sep 1900 UTC	51/20 49/30 46/40 43/50	-	310 320 330 350 360 370 390
J	20 Sep 1130 UTC	20 Sep 1900 UTC	50/20 48/30 45/40 42/50 42/60	-	310 320 330 350 360 370 390
K	20 Sep 1130 UTC	20 Sep 1900 UTC	44/40 41/50	-	310 330 350 370 390
S	22 Sep 0100 UTC	22 Sep 0800 UTC	57/50 57/40 58/30 57/20	320 340 350 360 380 390 400	-
T	21 Sep 0100 UTC	21 Sep 0800 UTC	53/50 54/40 54/30 54/20	320 330 340 350 360 370 380 390 400	-
T	22 Sep 0100 UTC	22 Sep 0800 UTC	56/50 56/40 57/30 56/20	320 340 350 360 380 390 400	-
U	21 Sep 0100 UTC	21 Sep 0800 UTC	52/50 53/40 53/30 53/20	320 330 340 350 360 370 380 390 400	-
U	22 Sep 0100 UTC	22 Sep 0800 UTC	49/50 50/40 51/30 52/20	320 330 340 350 360 370 380 390 400	-
V	21 Sep 0100 UTC	21 Sep 0800 UTC	51/50 52/40 52/30 52/20	320 330 340 350 360 370 380 390 400	-
V	22 Sep 0100 UTC	22 Sep 0800 UTC	48/50 49/40 50/30 51/20	320 330 340 350 360 370 380 390 400	-
W	21 Sep 0100 UTC	21 Sep 0800 UTC	5030/50 5130/40 5130/30 5130/20	350 360 370 380 390	-
W	22 Sep 0100 UTC	22 Sep 0800 UTC	4730/50 4830/40 4930/30 5030/20	350 360 370 380 390	-
X	21 Sep 0100 UTC	21 Sep 0800 UTC	50/50 51/40 51/30 51/20	320 330 340 350 360 370 380 390 400	-
X	22 Sep 0100 UTC	22 Sep 0800 UTC	47/50 48/40 49/30 50/20	320 330 340 350 360 370 380 390 400	-
Y	21 Sep 0100 UTC	21 Sep 0800 UTC	49/50 50/40 50/30 50/20	320 330 340 350 360 370 380 390 400	-
Y	22 Sep 0100 UTC	22 Sep 0800 UTC	46/50 47/40 48/30 49/20	320 330 350 360 380 390 400	-
Z	21 Sep 0100 UTC	21 Sep 0800 UTC	44/50 46/40 46/30 45/20	350 370	-
Z	22 Sep 0100 UTC	22 Sep 0800 UTC	43/50 46/40 47/30 48/20 48/15	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	21 Sep 0700 UTC	21 Sep 2100 UTC	42N160E 45N170E 47N180E 49N170W 52N160W 53N150W 52N140W
11	21 Sep 1000 UTC	21 Sep 2100 UTC	36N150E 38N160E 38N170E 36N180E 32N170W
12	21 Sep 1000 UTC	21 Sep 2100 UTC	36N150E 36N160E 34N170E 31N180E 27N170W
14	21 Sep 0700 UTC	21 Sep 2100 UTC	39N160E 41N170E 42N180E 43N170W 44N160W 44N150W 42N140W 38N130W
2	21 Sep 0700 UTC	21 Sep 2100 UTC	41N160E 44N170E 45N180E 46N170W 47N160W 47N150W 46N140W 42N130W
3	21 Sep 0700 UTC	21 Sep 2100 UTC	40N160E 43N170E 44N180E 45N170W 46N160W 46N150W 44N140W 40N130W
8	21 Sep 0700 UTC	21 Sep 2100 UTC	41N160E 44N170E 45N180E 47N170W 48N160W 48N150W 47N140W 43N130W
A	21 Sep 1900 UTC	22 Sep 0800 UTC	24N170W 27N180E 29N170E 30N160E 32N150E
C	21 Sep 1900 UTC	22 Sep 0800 UTC	52N140W 54N150W 56N160W 56N170W
E	21 Sep 1900 UTC	22 Sep 0800 UTC	42N130W 45N140W 48N150W 51N160W 53N170W 53N180E
F	21 Sep 1900 UTC	22 Sep 0800 UTC	43N140W 46N150W 49N160W 50N170W 49N180E 47N170E 44N160E
H	21 Sep 1900 UTC	22 Sep 0800 UTC	36N140W 34N150W 32N160W 30N170W 29N180E 28N170E 26N160E 25N150E 22N140E
J	21 Sep 0500 UTC	21 Sep 2100 UTC	47N140W 50N150W 54N160W
K	21 Sep 0500 UTC	21 Sep 2100 UTC	35N140W 34N150W 33N160W 31N170W 30N180E 29N170E 28N160E 27N150E 27N140E
M	21 Sep 1900 UTC	22 Sep 0800 UTC	52N140W 54N150W 56N160W 56N170W