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 map 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 19 Sep 1130 UTC 19 Sep 1900 UTC SOMAX 49/20 48/30 45/40 43/50 JEBBY CARAC 350 370 390
A 20 Sep 1130 UTC 20 Sep 1900 UTC BEDRA 48/20 45/30 42/40 40/50 40/60 DOVEY 350 370 390
Y 20 Sep 0100 UTC 20 Sep 0800 UTC RIKAL 53/50 56/40 57/30 57/20 PIKIL SOVED 320 340 360 380 400
Z 20 Sep 0100 UTC 20 Sep 0800 UTC TUDEP 52/50 55/40 56/30 56/20 RESNO NETKI 320 340 360 380 400
Warning: Do not use this data for real-world aviation or navigation. No guarantee of current accuracy is given.