Elon Musk has been tapped to build a futuristic transportation system using high-powered electric "skates" to carry passengers between O'Hare International Airport and downtown Chicago. Chicago Mayor Rahm Emanuel will formally announce Thursday that his administration is entering one-on-one negotiations with Musk's Boring Company to build the high-speed system that will utilize electric vehicles running through twin underground tunnels, said Adam Collins, the mayor's spokesman.