In return, the Mayor won pledges from Pataki to "pressure" the Port Authority not to pass costs from the project to the city in the form of reduced airport rent (and in fact to hold the city harmless with state money, if necessary), and to "push" the PA to begin work on a rail link to LaGuardia. One worry about such a contingency-laden deal is that any state participation could come at the expense of funding normally slated for the MTA and other transit systems around the state.