ORD - O'Hare International Airport, Chicago (IL)
CHI - All airports, Chicago (IL)
MDW - Chicago Midway International Airport, Chicago (IL)
GYY - Gary/Chicago International Airport, Gary (IN)
RFD - Chicago Rockford International Airport, Rockford (IL)
MLI - Quad City International Airport, Moline (IL)
BMI - Central Illinois Regional Airport, Bloomington-Normal (IL)
PIA - General Wayne Downing Peoria International Airport, Peoria (IL)
CMI - University of Illinois Willard Airport, Champaign (IL)
SPI - Abraham Lincoln Capital Airport, Springfield (IL)
DEC - Decatur Airport, Decatur (IL)
UIN - Quincy Regional Airport (Baldwin Field), Quincy (IL)
MWA - Williamson County Regional Airport, Marion (IL)
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