Consolidated Fastfrate operated a freight-forwarding business with branches across Canada. Their business consisted of picking up freight in one province, consolidating it into containers, arranging for transportation to the destination province, and distributing that freight to various locations in the province. The business was managed and rates set at a regional or national level. The branch employees did not cross provincial boundaries, and third-party carriers transferred the containers between branches. A union representing the employees in branches in Alberta, Saskatchewan, and Manitoba applied to the Canada Industrial Labour Relations Board for certification, and in this action the union was applying for a declaration whether the employees should be federally or provincially certified. Explain the arguments for both sides and the likely decision.