TORONTO -- The Toronto Port Authority is seeking up to $100 million in federal funding for infrastructure improvements at the Billy Bishop Toronto City Airport.

The port authority says it has presented a preliminary estimate for improvements related to airport access and related vehicle traffic to the federal Building Canada Fund, on behalf of the City of Toronto.

The TPA is a self-funding federal agency but its chairman, Mark McQueen, says its financial resources will be strained by the cost of a proposed runway extension and normal spending requirement.

The runway extension is part of a controversial proposal from Porter Airlines, which wants to begin using Bombardier CSeries jets at airport on Toronto's waterfront.

The port authority says it has been asked by city staff to attend a public meeting on Monday as part of a series of public consultations on Porter's request.