Since we negotiate the expanded agreements based on the advice and requests we receive from our carriers, we normally would see the demand there and see them grow. Having said that, there are certainly examples where one of our domestic carriers has asked for additional rights, which we've negotiated on their behalf, and then they've stopped taking advantage of those rights because the route becomes unprofitable to them or there are other changes in the market.
I don't know of any further analysis we've done to measure the ebb and flow. Perhaps Marc would have a comment.