The relationship between an airport and an airline is a really close partnership. We provide what I call the intermodal infrastructure, where we take people from the car, from the ground transportation, through our facility onto an aircraft, and the airline takes them to their final destination. In terms of charges, taking Toronto Pearson as an example, I have a charge, what I call aeronautical charges, which provide charges for the service the airline uses at an airport. I also have a charge called AIF, which I charge the passengers to pay for the infrastructure that is in an airport the passenger is using. I have a last source of revenue which comes out of non-aeronautical, which are other retails and concessions and so on.
In terms of aeronautical charges, I think what an airline pays is a small portion compared to what they pay for fuel, for staff, and for their own financing of aircraft. Our charges are probably a smaller percentage compared to those other costs they bear.