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	09 Apr 1130 UTC	09 Apr 1900 UTC	GOMUP 59/20 60/30 61/40 60/50 URTAK		350 370 390
A	10 Apr 1130 UTC	10 Apr 1900 UTC	GOMUP 59/20 61/30 62/40 62/50 PIDSO		350 360 370 380 390
B	10 Apr 1130 UTC	10 Apr 1900 UTC	SUNOT 58/20 60/30 61/40 61/50 SAVRY		350 360 370 380 390
B	09 Apr 1130 UTC	09 Apr 1900 UTC	SUNOT 58/20 59/30 60/40 59/50 AVUTI		350 370 390
D	10 Apr 1130 UTC	10 Apr 1900 UTC	RESNO 56/20 58/30 59/40 59/50 AVUTI		350 360 370 380 390
E	10 Apr 1130 UTC	10 Apr 1900 UTC	DOGAL 55/20 57/30 58/40 58/50 DORYY		340 350 360 370 380 390
E	09 Apr 1130 UTC	09 Apr 1900 UTC	RESNO 56/20 57/30 57/40 56/50 JANJO		340 350 360 370 380 390
F	09 Apr 1130 UTC	09 Apr 1900 UTC	DOGAL 55/20 56/30 56/40 55/50 LOMSI		340 350 360 370 380 390
F	10 Apr 1130 UTC	10 Apr 1900 UTC	MALOT 54/20 56/30 57/40 57/50 HOIST		340 350 360 370 380 390
G	10 Apr 1130 UTC	10 Apr 1900 UTC	LIMRI 53/20 55/30 56/40 56/50 JANJO		340 350 360 370 380 390
U	09 Apr 0100 UTC	09 Apr 0800 UTC	TUDEP 52/50 53/40 54/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
U	10 Apr 0100 UTC	10 Apr 0800 UTC	RIKAL 53/50 56/40 57/30 57/20 SUNOT KESIX	340 350 360 370 380 390 400
V	09 Apr 0100 UTC	09 Apr 0800 UTC	ALLRY 51/50 52/40 53/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
V	10 Apr 0100 UTC	10 Apr 0800 UTC	TUDEP 52/50 55/40 56/30 56/20 PIKIL SOVED	340 350 360 370 380 390 400
W	09 Apr 0100 UTC	09 Apr 0800 UTC	ELSIR 50/50 51/40 52/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
W	10 Apr 0100 UTC	10 Apr 0800 UTC	ALLRY 51/50 54/40 55/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
X	09 Apr 0100 UTC	09 Apr 0800 UTC	JOOPY 49/50 50/40 51/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
X	10 Apr 0100 UTC	10 Apr 0800 UTC	ELSIR 50/50 53/40 54/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
Y	09 Apr 0100 UTC	09 Apr 0800 UTC	NICSO 48/50 49/40 50/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
Y	10 Apr 0100 UTC	10 Apr 0800 UTC	JOOPY 49/50 52/40 53/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
Z	09 Apr 0100 UTC	09 Apr 0800 UTC	PORTI 47/50 48/40 49/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
Z	10 Apr 0100 UTC	10 Apr 0800 UTC	RAFIN 45/50 48/40 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