The Globe and Mail reports in its Thursday edition that expanding Billy Bishop Airport's main runway on Toronto's waterfront by nearly a kilometre into Lake Ontario to allow for commercial jets and millions more annual passengers could cost $4-billion to $5-billion over the next 25 years, the head of the federal agency that oversees the facility says. The Globe's Jeff Gray writes that Roelof-Jan Steenstra, the Toronto Port Authority's president, revealed the price tag -- many times higher than those floated for expansion plans in past years -- at a provincial legislative committee this week. On Tuesday, Mr. Steenstra appeared before the province's standing committee on heritage, infrastructure and cultural policy. It held one day of hearings on the Ontario government's proposed legislation to strip the City of Toronto of its stake in the island airport in order to expand Billy Bishop and allow commercial jets. The bill, which also includes sweeping powers to potentially take other land on the Toronto Islands, would upend a decades-old deal that includes the city, the port authority and the federal government and that currently restricts the airport's commercial carriers to turboprops owned by Porter and Air Canada.