| Casey | 
1 | 
1 codesAirport codes Casey | 
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| Centralia | 
6 | 
6 codesAirport codes Centralia | 
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| Champaign | 
3 | 
3 codesAirport codes Champaign | 
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| Champaign/Urbana | 
2 | 
2 codesAirport codes Champaign/Urbana | 
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| Channahon | 
3 | 
3 codesAirport codes Channahon | 
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| Chapin | 
1 | 
1 codesAirport codes Chapin | 
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| Chatham | 
2 | 
2 codesAirport codes Chatham | 
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| Chatsworth | 
1 | 
1 codesAirport codes Chatsworth | 
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| Chebanse | 
1 | 
1 codesAirport codes Chebanse | 
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| Chemung | 
1 | 
1 codesAirport codes Chemung | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| Munch Heliport | 
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IL62 | 
42° 25' 19.065" N | 
088° 43' 50.366" W | 
 
  
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| Chenoa | 
3 | 
3 codesAirport codes Chenoa | 
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| Cherry | 
1 | 
1 codesAirport codes Cherry | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| POTTINGER RLA | 
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41° 25' 47.122" N | 
089° 09' 50.304" W | 
 
  
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| Chester | 
1 | 
1 codesAirport codes Chester | 
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| Chicago | 
27 | 
27 codesAirport codes Chicago | 
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| Chicago (West Chicago) | 
2 | 
2 codesAirport codes Chicago (West Chicago) | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| DUPAGE | 
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41° 54' 28.000" N | 
088° 14' 55.000" W | 
 
| Dupage Airport | 
KDPA | 
DPA | 
41° 54' 52" N | 
88° 14' 47" W | 
 
  
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| Chicago Heights | 
1 | 
1 codesAirport codes Chicago Heights | 
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| Chicago/Barrington | 
1 | 
1 codesAirport codes Chicago/Barrington | 
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| Chicago/Lake In The Hills | 
1 | 
1 codesAirport codes Chicago/Lake In The Hills | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| LAKE IN THE HILLS | 
 | 
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42° 12' 24.491" N | 
088° 19' 22.945" W | 
 
  
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| Chicago/Lansing | 
1 | 
1 codesAirport codes Chicago/Lansing | 
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| Chicago/Oak Lawn/ | 
1 | 
1 codesAirport codes Chicago/Oak Lawn/ | 
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| Chicago/Prospect Heights | 
1 | 
1 codesAirport codes Chicago/Prospect Heights | 
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| Chicago/Prospect Hgts/Whee | 
1 | 
1 codesAirport codes Chicago/Prospect Hgts/Whee | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| PALWAUKEE MUNI | 
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42° 06' 51.200" N | 
087° 54' 05.380" W | 
 
  
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| Chicago/Romeoville | 
1 | 
1 codesAirport codes Chicago/Romeoville | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| LEWIS UNIVERSITY | 
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41° 36' 30.048" N | 
088° 05' 38.553" W | 
 
  
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| Chicago/Schaumburg | 
3 | 
3 codesAirport codes Chicago/Schaumburg | 
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| Chicago/Tinley Park | 
1 | 
1 codesAirport codes Chicago/Tinley Park | 
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| Clifton | 
1 | 
1 codesAirport codes Clifton | 
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| Clinton | 
5 | 
5 codesAirport codes Clinton | 
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| Cobden | 
1 | 
1 codesAirport codes Cobden | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| Houseman Airport | 
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IL16 | 
37° 32' 24.181" N | 
089° 07' 21.282" W | 
 
  
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| Colona | 
1 | 
1 codesAirport codes Colona | 
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| Columbia | 
3 | 
3 codesAirport codes Columbia | 
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| Colusa | 
1 | 
1 codesAirport codes Colusa | 
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| Compton | 
3 | 
3 codesAirport codes Compton | 
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| Concord | 
1 | 
1 codesAirport codes Concord | 
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| Cooksville | 
1 | 
1 codesAirport codes Cooksville | 
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| Cordova | 
1 | 
1 codesAirport codes Cordova | 
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| Cornell | 
2 | 
2 codesAirport codes Cornell | 
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| Coulterville | 
1 | 
1 codesAirport codes Coulterville | 
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| Creston | 
1 | 
1 codesAirport codes Creston | 
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| Crystal Lake | 
3 | 
3 codesAirport codes Crystal Lake | 
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| Custer Park | 
1 | 
1 codesAirport codes Custer Park | 
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| Name | ICAO | IATA | Latitude | Longtitude |  
| Corn Field Airport | 
 | 
IL95 | 
41° 13' 23.110" N | 
088° 08' 43.200" W | 
 
  
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