From the point of view of some other units it has been a pain in the ****. Even units as far away as Gander and New York are being hit by routing restrictions as NERC restrictions are dictating where North Atlantic Tracks can go, and there is no sign of an end in sight. There are even rumours that some of the NAT route restrictions may go on indefinately. NERC has only been a success(ish) because other units have been protecting it.