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	12 May 1130 UTC	12 May 1900 UTC	GOMUP 59/20 59/30 58/40 57/50 HOIST		340 350 360 370 380 390
A	11 May 1130 UTC	11 May 1900 UTC	GOMUP 59/20 60/30 59/40 58/50 CUDDY		340 350 360 370 380 390
B	12 May 1130 UTC	12 May 1900 UTC	SUNOT 58/20 58/30 57/40 56/50 JANJO		340 350 360 370 380 390
B	11 May 1130 UTC	11 May 1900 UTC	SUNOT 58/20 59/30 58/40 57/50 HOIST		340 350 360 370 380 390
D	11 May 1130 UTC	11 May 1900 UTC	RESNO 56/20 57/30 56/40 55/50 LOMSI		340 350 360 370 380 390
E	12 May 1130 UTC	12 May 1900 UTC	RESNO 56/20 56/30 55/40 52/50 TUDEP		340 350 360 370 380 390
E	11 May 1130 UTC	11 May 1900 UTC	DOGAL 55/20 56/30 55/40 54/50 NEEKO		340 350 360 370 380 390
F	12 May 1130 UTC	12 May 1900 UTC	VENER 5530/20 5530/30 5430/40 5130/50 UMESI		350 360 370 380 390
F	11 May 1130 UTC	11 May 1900 UTC	MALOT 54/20 55/30 54/40 53/50 RIKAL		340 350 360 370 380 390
G	11 May 1130 UTC	11 May 1900 UTC	LIMRI 53/20 54/30 53/40 52/50 TUDEP		340 350 360 370 380 390
G	12 May 1130 UTC	12 May 1900 UTC	DOGAL 55/20 55/30 54/40 51/50 ALLRY		340 350 360 370 380 390
V	12 May 0100 UTC	12 May 0800 UTC	JOOPY 49/50 51/40 52/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
V	11 May 0100 UTC	11 May 0800 UTC	NICSO 48/50 50/40 51/30 53/20 MALOT GISTI	340 350 360 370 380 390 400
W	12 May 0100 UTC	12 May 0800 UTC	NICSO 48/50 50/40 51/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
W	11 May 0100 UTC	11 May 0800 UTC	PORTI 47/50 49/40 50/30 52/20 LIMRI XETBO	340 350 360 370 380 390 400
X	12 May 0100 UTC	12 May 0800 UTC	OMSAT 4730/50 4930/40 5030/30 5030/20 RODEL EPUNA	350 360 370 380 390
X	11 May 0100 UTC	11 May 0800 UTC	SUPRY 46/50 48/40 49/30 51/20 DINIM ELSOX	340 350 360 370 380 390 400
Y	11 May 0100 UTC	11 May 0800 UTC	RAFIN 45/50 47/40 48/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
Y	12 May 0100 UTC	12 May 0800 UTC	PORTI 47/50 49/40 50/30 50/20 SOMAX ATSUR	340 350 360 370 380 390 400
Z	11 May 0100 UTC	11 May 0800 UTC	MUNEY 41/60 44/50 46/40 47/30 49/20 BEDRA NASBA	360 380 400
Z	12 May 0100 UTC	12 May 0800 UTC	SUPRY 46/50 48/40 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