Under the terms of the request, the rail service should have travel times of 20 minutes or less with a reliable frequency of at least every 15 minutes for most of the day with “premium” fares that cost less than the cost of current taxi and ride-hailing services. Such services in other cities have charged $30 or more per rider, raising questions about how many people would be willing to pay those types of rates when the CTA Blue Line already goes to and from the airport for much less.