Just tunnel under ORD and build a station(s) that services the concourses just outside tsa check points. It is a lot of rock BTW. If I remember runway 14L - 32 R would cause the longest part of the bore.
A tunnel under an active airport would be an expensive undertaking for an unknown and probably small number of passengers.
I'm surprizes that no one has mentioned Newark Liberty Airport in this discussion. The monorail that runs between the three terminals and the parking lots also goes to the train station on the NEC. Most Amtrak trains do not stop at this station, but many NJTransit trains do. Newark Penn Station is only 5 minutes north; all Amtrak trains stop there, and the transfer to NJT is convenient.
Last I heard the Newark Airport Monorail is a epic fail. Oddly you cant walk or ride your bicycle to the Newark Airport Terminal as it is on all Port Land of NYNJ and is restricted access
From what I understand is that airport fed money could only be used for in airport transportation which is why airport people movers never leave the airport..that policy just changed this past year to fund airport rail links but details are lacking
blue streak 1Just tunnel under ORD
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