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	26 Jul 1130 UTC	26 Jul 1900 UTC	ERAKA 60/20 60/30 59/40 58/50 DORYY		340 350 360 370
A	27 Jul 1130 UTC	27 Jul 1900 UTC	SUNOT 57/20 57/30 56/40 55/50 LOMSI		340 350 360 370 380 390
B	26 Jul 1130 UTC	26 Jul 1900 UTC	GOMUP 59/20 59/30 58/40 57/50 HOIST		340 350 360 370 380 390
C	26 Jul 1130 UTC	26 Jul 1900 UTC	SUNOT 58/20 58/30 56/40 55/50 LOMSI		340 350 360 370 380 390
D	27 Jul 1130 UTC	27 Jul 1900 UTC	RESNO 55/20 55/30 54/40 53/50 RIKAL		340 350 360 370 380 390
E	27 Jul 1130 UTC	27 Jul 1900 UTC	VENER 5430/20 5430/30 5330/40 5230/50 SAXAN		350 360 370 380 390
E	26 Jul 1130 UTC	26 Jul 1900 UTC	RESNO 56/20 56/30 54/40 53/50 RIKAL		340 350 360 370 380 390
F	26 Jul 1130 UTC	26 Jul 1900 UTC	DOGAL 55/20 55/30 53/40 52/50 TUDEP		340 350 360 370 380 390
F	27 Jul 1130 UTC	27 Jul 1900 UTC	DOGAL 54/20 54/30 53/40 52/50 TUDEP		340 350 360 370 380 390
G	27 Jul 1130 UTC	27 Jul 1900 UTC	MALOT 53/20 53/30 52/40 51/50 ALLRY		340 350 360 370 380 390
T	27 Jul 0100 UTC	27 Jul 0800 UTC	JOOPY 49/50 51/40 53/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
T	26 Jul 0100 UTC	26 Jul 0800 UTC	ELSIR 50/50 51/40 52/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
U	27 Jul 0100 UTC	27 Jul 0800 UTC	NICSO 48/50 50/40 52/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
U	26 Jul 0100 UTC	26 Jul 0800 UTC	JOOPY 49/50 50/40 51/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
V	26 Jul 0100 UTC	26 Jul 0800 UTC	NICSO 48/50 49/40 50/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
V	27 Jul 0100 UTC	27 Jul 0800 UTC	OMSAT 4730/50 4930/40 5130/30 5130/20 ADARA LEKVA	350 360 370 380 390
W	26 Jul 0100 UTC	26 Jul 0800 UTC	OMSAT 4730/50 4830/40 4930/30 5030/20 RODEL EPUNA	350 360 370 380 390
W	27 Jul 0100 UTC	27 Jul 0800 UTC	PORTI 47/50 49/40 51/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
X	26 Jul 0100 UTC	26 Jul 0800 UTC	PORTI 47/50 48/40 49/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
X	27 Jul 0100 UTC	27 Jul 0800 UTC	RELIC 4630/50 4830/40 5030/30 5030/20 RODEL EPUNA	350 360 370 380 390
Y	26 Jul 0100 UTC	26 Jul 0800 UTC	SUPRY 46/50 47/40 48/30 49/20 BEDRA NASBA	350 360 380 390 400
Y	27 Jul 0100 UTC	27 Jul 0800 UTC	SUPRY 46/50 48/40 50/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
Z	26 Jul 0100 UTC	26 Jul 0800 UTC	RAFIN 45/50 46/40 47/30 48/20 48/15 OMOKO GUNSO	350 360 380 390 400
Z	27 Jul 0100 UTC	27 Jul 0800 UTC	RAFIN 45/50 47/40 49/30 49/20 BEDRA NASBA	350 360 380 390 400

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