Missing from the mayor's call to action was any kind of evidence that there would be enough customer demand for the service, as well as any data on exactly how much time would be saved for travelers, compared with existing Blue Line service to and from the airport. We wondered at the time whether the city would be better off updating Blue Line service to spruce up the experience for businesspeople bound for O'Hare, an undertaking that probably could be done at a fraction of the cost and inconvenience to the rest of the city.