It certainly could. You'll recall that back in 2015, there was a different proposal with the three parties. The city and, at that time, Porter Airlines made that proposal, and the federal government decided that it would not allow for the reopening of the tripartite agreement to accommodate that. Of course, that stopped all activity on that proposal at the time.
Should the federal government take the position that it does not want to see an expansion of the airport, that would certainly stop it. However, I would point out that the government did make an investment in pre-clearance of about $30 million at the airport. It also made some recent decisions with respect to Pickering, so there are two airports within the city of Toronto that are looking to accommodate future aviation demand.