All taxiways at Chicago O’Hare International Airport (ORD) once identified by a “Z” prefix have been eliminated as the City of Chicago continues toward the May 2, 2013 renaming of Runway 10-28. That runway will become 10L-28R in advance of this fall’s opening of the new Runway 10C-28C. ORD taxiways will now be identified with double letters such as “DD” or “GG.”