I'm having trouble trying to figure out how another airline can fly "Polar cargo" when Polar isn't flying...
IIRC, Polar is a scheduled service. They "sell" space on their airplanes to freight forwarders, and maybe other similar customers. There is no "Polar cargo" until that cargo is consigned to Polar for shipment. If Polar isn't flying because of a strike, a sane freight forwarder will simply consign his freight to another airline rather than consign it to Polar and risk it sitting on the ground.
Am I missing something here?