Depreciation is a standard deduction in calculating operating expenses. It usually amounts to a dollar figure that could exceed interest, depending on the amortization period.

However, the text of the agreement in principle states that Canada will make payments to the U.S. totalling 50 per cent of “net bridge and crossing related revenues” for 15 years, and doesn’t clearly define what counts as operating costs or make mention of Canada’s debt. https://globalnews.ca/news/11978035/carney-premiers-us-tariff-threat/