The Globe and Mail reports in its Monday, May 4, edition that the expansion of the Billy Bishop Airport would be disastrous for Canada's largest city. The Globe's Alex Bozikovic writes that it is being pushed by private interests, including American capital, who have provided no convincing rationale. Nobody is counting the negative impacts of an expansion or imagining other options for the site. Only Prime Minister Mark Carney can stop it from taking off. He is well qualified to evaluate the airport's business case, which is bogus. Nearly all of Toronto's air travel, about 95 per cent, passes through Pearson International Airport. Yet Billy Bishop proponents claim the tiny secondary airport generates huge economic impacts. They say an expansion would boost that contribution to $8.5-billion a year, nearly half of Pearson's 2025 impacts of $19.6-billion. How is that plausible? The province won't say. Billy Bishop's jet advocates -- Nieuport Aviation, which owns the airport terminal and is controlled by JPMorgan Asset Management, and the federal Toronto Port Authority -- likewise offer few specifics. Their broad claim is that chief executive officers like the airport.