A zero with a positive or negative sign in EBCDIC is x'C0' and x'D0' which is also the representation for special characters { and }. Using the modified-zoned-decimal these translate to the ASCII values for { and } which is x'7B' and x'7D' and the rightmost nibble is no longer the binary value of the digit.
Chicago Midway International Airport (IATA: MDW, ICAO: KMDW, FAA LID: MDW) is an international airport on the southwest side of Chicago, Illinois, eight miles (13 km) from the Loop. Dominated by low-cost carrier Southwest Airlines, Midway is the Dallas-based carrier's largest focus city, as of 2013.
Closest Airport to Olympia Fields, IL. The closest airport is Chicago Midway International Airport (MDW). Distance from Chicago Midway International Airport to Olympia Fields is 31,0 kilometers (19,3 miles). Chicago Midway International Airport is located approximately 5,9 kilometers (3,7 miles) northeast of Bridgeview and about 6,2 kilometers (3,9 miles) north of Burbank.