The Boring Co. was selected to build the rapid transit system in June, to much fanfare. Emanuel has been enthusiastic about Musk’s plan to dig a hole from the Loop to O’Hare and run passenger vehicles that could go more than 100 miles per hour, cutting the time to get to and from the airport to about 12 minutes. The trip would cost about $20 to $25 per passenger, and would offer travelers an alternative to costlier cab rides and the cheaper, but more plebian, CTA “L.”