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
B	02 Jun 1130 UTC	02 Jun 1900 UTC	RESNO 55/20 54/30 53/40 51/50 ALLRY		340 350 360 370 380 390
B	03 Jun 1130 UTC	03 Jun 1900 UTC	RESNO 56/20 57/30 57/40 57/50 HOIST		340 350 360 370 380 390
C	02 Jun 1130 UTC	02 Jun 1900 UTC	LIMRI 52/20 51/30 49/40 48/50 NICSO		340 350 360 370 380 390
C	03 Jun 1130 UTC	03 Jun 1900 UTC	DOGAL 55/20 56/30 56/40 56/50 JANJO		340 350 360 370 380 390
D	03 Jun 1130 UTC	03 Jun 1900 UTC	MALOT 54/20 55/30 55/40 55/50 LOMSI		340 350 360 370 380 390
D	02 Jun 1130 UTC	02 Jun 1900 UTC	DINIM 51/20 50/30 48/40 47/50 PORTI		340 350 360 370 380 390
E	03 Jun 1130 UTC	03 Jun 1900 UTC	SOMAX 50/20 50/30 49/40 47/50 PORTI		350 360 370 390
E	02 Jun 1130 UTC	02 Jun 1900 UTC	SOMAX 50/20 49/30 47/40 45/50 RAFIN		340 350 360 370 380 390
F	02 Jun 1130 UTC	02 Jun 1900 UTC	BEDRA 49/20 48/30 46/40 44/50 BOBTU JAROM		340 350 360 370 380 390
F	03 Jun 1130 UTC	03 Jun 1900 UTC	BEDRA 49/20 49/30 48/40 46/50 SUPRY		350 360 370 390
G	03 Jun 1130 UTC	03 Jun 1900 UTC	OMOKO 48/15 48/20 48/30 47/40 45/50 RAFIN		350 360 370 390
G	02 Jun 1130 UTC	02 Jun 1900 UTC	OMOKO 48/15 48/20 47/30 45/40 43/50 JEBBY CARAC		340 350 360 370 380 390
S	02 Jun 0100 UTC	02 Jun 0800 UTC	DORYY 58/50 59/40 60/30 60/20 59/15 ERAKA ETSOM	340 360 370 380 400
T	03 Jun 0100 UTC	03 Jun 0800 UTC	NEEKO 54/50 55/40 57/30 57/20 SUNOT KESIX	340 350 360 370 380 390 400
U	03 Jun 0100 UTC	03 Jun 0800 UTC	RIKAL 53/50 54/40 56/30 56/20 PIKIL SOVED	340 350 360 370 380 390 400
U	02 Jun 0100 UTC	02 Jun 0800 UTC	JANJO 56/50 57/40 58/30 58/20 SUNOT KESIX	340 350 360 370 380 390 400
V	03 Jun 0100 UTC	03 Jun 0800 UTC	SAXAN 5230/50 5330/40 5530/30 5530/20 ETARI MOGLO	350 360 370 380 390
V	02 Jun 0100 UTC	02 Jun 0800 UTC	LOMSI 55/50 56/40 57/30 57/20 PIKIL SOVED	340 350 360 370 380 390 400
W	02 Jun 0100 UTC	02 Jun 0800 UTC	NEEKO 54/50 55/40 56/30 56/20 RESNO NETKI	340 350 360 370 380 390 400
W	03 Jun 0100 UTC	03 Jun 0800 UTC	TUDEP 52/50 53/40 55/30 55/20 RESNO NETKI	340 350 360 370 380 390 400
X	02 Jun 0100 UTC	02 Jun 0800 UTC	RIKAL 53/50 54/40 55/30 55/20 DOGAL BEXET	340 350 360 370 380 390 400
X	03 Jun 0100 UTC	03 Jun 0800 UTC	UMESI 5130/50 5230/40 5430/30 5430/20 VENER KOKIB	350 360 370 380 390
Y	02 Jun 0100 UTC	02 Jun 0800 UTC	RAFIN 45/50 48/40 50/30 51/20 DINIM ELSOX	340 360 380 400
Y	03 Jun 0100 UTC	03 Jun 0800 UTC	ALLRY 51/50 52/40 54/30 54/20 DOGAL BEXET	340 350 360 370 380 390 400
Z	02 Jun 0100 UTC	02 Jun 0800 UTC	SOORY 44/50 47/40 49/30 50/20 SOMAX ATSUR	360 380 400
Z	03 Jun 0100 UTC	03 Jun 0800 UTC	ELSIR 50/50 51/40 53/30 53/20 MALOT GISTI	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