Actually, throwaway and hidden city ticketing are not the same as fuel dumps. A fuel dump typically involves adding another leg to a different country than your intended final point in order to get rid of a fuel surcharge. Adding a flight from a hub to a nonhub within the same country doesn't have any effect on fuel surcharges, but rather prices as a different fare. The base fare from NY to Houston and the price from NY to Dallas may be different, even though one valid routing to get to Dallas will entail connecting in Houston.