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It is theoretically possible to give the northern Chicago suburbs a direct, one-seat rail connection to O'Hare International Airport. The best part of this is that it would run almost entirely over disused, former railroad rights-of-way that have not (yet) been developed.
From a northern terminal in the Lake-Cook Road region, the rail line would travel south, over the abandoned Skokie Valley Route of the CNS&M to the Dempster-Skokie area. From there, the rail line would continue south over the abandoned Skokie-Weber-Mayfair Line of the C&NW. At Mayfair, a connection would be built to the CTA Blue Line where it continues on to O'Hare in the Median of the Kennedy Expressway.
I do not really believe this is economically or politically feasible, at least within my lifetime, so consider it the autistic foamer equivalent of fan-fiction.
