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.
This airport has international and domestic flights from Chicago, Illinois and is 16 miles from the center of Oakbrook Terrace, IL. Another major airport is Chicago Midway International Airport (MDW / KMDW), which has international and domestic flights from Chicago, Illinois and is 21 miles from Oakbrook Terrace, IL.