A plan by major airlines to add as much as $40 to every roundtrip ticket to thebeleaguered new Denver International Airportis causing a major political headache for the city's mayor, who is running for reelection, reportsTIME Denver bureau chief Richard Woodbury. United, American and Frontier announced the fee increases over the weekend, to cover extraordinarily high operating costs at the new airport. United Airlines runs 70 percent of the flights to and from Denver. It said that it upped the fee to meet the $195 million in rent and landing fees it will have to pay at the new airport, which is expected to open in about a month. Those costs are more than five times what United pays at Stapleton International Airport.