Abbreviate Illinois as IL.
ORD
The abbreviation ORD stands for Chicago O'Hare international airport.
Chicago Midway International Airport current IATA code "MDW" .
Before Chicago's largest airport was named O'Hare, it was known as Orchard Field. That's where the FAA designation ORD originated.
The airport code for Chicago Executive Airport is PWK.
The airport that has KVA as the abbreviation is an airport in Greece named Kavala International Airport. Kavala International Airport serves the East Macedonian and Thrace regions in Greece.
I don't believe that there is an abbreviation for Chicago.
The National Oceanic and Atmospheric Administration (NOAA, at www.noaa.gov) uses "AP" as the abbreviation for airport. This is the only place where I could find an actual abbreviation in use. Unless you're involved in aviation, I think it's probably common to not abbreviate the word "airport" at all. In the aviation industry, three or four letter codes are used to represent individual airports (like "KORD" or "ORD" for Chicago O'Hare), but there isn't a standard abbreviation for just a generic usage of "airport".
Chicago's O'Hare International Airport.
The address of the Chicago Rockford airport is 1790 Dundrea Road, Chicago. This airport is very large and popular and is located in the United States of America.
Chicago Midway International Airport.
Midway International Airport is located in Chicago, Illinois. It is the second largest airport in the entire state of Illinois, after Chicago O'Hare International Airport, and is the largest airport in metropolitan Chicago.
Chicago Midway: IATA: MDW ICAO: KMDW