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	25 Jun 1130 UTC	25 Jun 1900 UTC	60/20 62/30 63/40 63/50	-	310 320 330 350 360 370
A	26 Jun 1130 UTC	26 Jun 1900 UTC	59/20 61/30 62/40 62/50	-	310 320 330 350 360 370 380 390
B	25 Jun 1130 UTC	25 Jun 1900 UTC	59/20 61/30 61/40 60/50	-	310 320 330 350 360 370
B	26 Jun 1130 UTC	26 Jun 1900 UTC	58/20 60/30 61/40 61/50	-	310 320 330 350 360 370 380 390
C	25 Jun 1130 UTC	25 Jun 1900 UTC	58/20 60/30 60/40 59/50	-	310 320 330 350 360 370
C	26 Jun 1130 UTC	26 Jun 1900 UTC	57/20 59/30 60/40 60/50	-	310 320 330 350 360 370 380 390
D	25 Jun 1130 UTC	25 Jun 1900 UTC	51/20 50/30 47/40 45/50	-	310 320 330 350 360 370 390
D	26 Jun 1130 UTC	26 Jun 1900 UTC	56/20 58/30 59/40 59/50	-	310 320 330 350 360 370 380 390
E	25 Jun 1130 UTC	25 Jun 1900 UTC	50/20 49/30 46/40 44/50	-	310 320 330 350 360 370 390
E	26 Jun 1130 UTC	26 Jun 1900 UTC	55/20 57/30 58/40 58/50	-	310 320 330 340 350 360 370 380 390
F	25 Jun 1130 UTC	25 Jun 1900 UTC	49/20 48/30 45/40 43/50	-	310 320 330 350 360 370 390
F	26 Jun 1130 UTC	26 Jun 1900 UTC	44/40 43/50	-	320 340 360 380
G	25 Jun 1130 UTC	25 Jun 1900 UTC	48/15 48/20 47/30 44/40 42/50 42/60	-	310 320 330 350 360 370 390
G	26 Jun 1130 UTC	26 Jun 1900 UTC	43/40 42/50 41/60	-	320 340 360 380
H	25 Jun 1130 UTC	25 Jun 1900 UTC	47/15 47/20 46/30 43/40 41/50 41/60	-	310 320 330 350 360 370 390
H	26 Jun 1130 UTC	26 Jun 1900 UTC	42/40 41/50 40/60	-	320 340 360 380
J	25 Jun 1130 UTC	25 Jun 1900 UTC	41/40 38/50 34/60	-	320 340 360 380
J	26 Jun 1130 UTC	26 Jun 1900 UTC	40/40 37/50 34/60	-	320 340 360 380
K	25 Jun 1130 UTC	25 Jun 1900 UTC	40/40 37/50 33/60	-	320 340 360 380
K	26 Jun 1130 UTC	26 Jun 1900 UTC	39/40 36/50 33/60	-	320 340 360 380
U	26 Jun 0100 UTC	26 Jun 0800 UTC	53/50 53/40 54/30 55/20	320 330 340 350 360 370 380 390 400	-
V	26 Jun 0100 UTC	26 Jun 0800 UTC	52/50 52/40 53/30 54/20	320 330 340 350 360 370 380 390 400	-
W	26 Jun 0100 UTC	26 Jun 0800 UTC	51/50 51/40 52/30 53/20	320 330 340 350 360 370 380 390 400	-
X	26 Jun 0100 UTC	26 Jun 0800 UTC	5030/50 5030/40 5130/30 5230/20	350 360 370 380 390	-
Y	26 Jun 0100 UTC	26 Jun 0800 UTC	50/50 50/40 51/30 52/20	320 330 340 350 360 370 380 390 400	-
Z	26 Jun 0100 UTC	26 Jun 0800 UTC	49/50 49/40 50/30 51/20	320 330 340 350 360 370 380 390 400	-

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
1	26 Jun 0700 UTC	26 Jun 2100 UTC	43N160E 45N170E 46N180E 48N170W 50N160W 51N150W 51N140W
11	26 Jun 1000 UTC	26 Jun 2100 UTC	36N150E 37N160E 36N170E 33N180E 29N170W
14	26 Jun 0700 UTC	26 Jun 2100 UTC	40N160E 42N170E 43N180E 44N170W 44N160W 43N150W 41N140W 38N130W
2	26 Jun 0700 UTC	26 Jun 2100 UTC	42N160E 44N170E 45N180E 46N170W 47N160W 47N150W 45N140W 41N130W
3	26 Jun 0700 UTC	26 Jun 2100 UTC	41N160E 43N170E 44N180E 45N170W 45N160W 44N150W 42N140W 39N130W
8	26 Jun 0700 UTC	26 Jun 2100 UTC	43N160E 45N170E 46N180E 48N170W 50N160W 51N150W 51N140W
A	26 Jun 1900 UTC	27 Jun 0800 UTC	25N170W 27N180E 29N170E 31N160E 33N150E
C	26 Jun 1900 UTC	27 Jun 0800 UTC	58N160W 57N180E
E	26 Jun 1900 UTC	27 Jun 0800 UTC	47N140W 51N150W 54N160W 55N180E
F	26 Jun 1900 UTC	27 Jun 0800 UTC	39N140W 38N150W 37N160W 36N170W 35N180E 34N170E 34N160E 35N150E
H	26 Jun 1900 UTC	27 Jun 0800 UTC	39N140W 37N150W 35N160W 33N170W 31N180E 29N170E 27N160E 25N150E 23N140E
I	26 Jun 1900 UTC	27 Jun 0800 UTC	35N130W 37N140W 36N150W 35N160W 33N170W 31N180E 29N170E 27N160E 25N150E 23N140E
J	26 Jun 0500 UTC	26 Jun 2100 UTC	40N130W 40N140W 39N150W 37N160W 35N170W 33N180E 31N170E 30N160E 29N150E 28N140E
K	26 Jun 0500 UTC	26 Jun 2100 UTC	39N140W 38N150W 36N160W 34N170W 32N180E 30N170E 29N160E 28N150E 27N140E
M	26 Jun 1900 UTC	27 Jun 0800 UTC	60N150W 60N160W