DuPage 3 letter ID

C81

Campbell

3CK

Lake in the Hills

57C

East Troy

C03

Nappanee

LL10

Naper Aero

10C

Howell

3TR

Niles

C59

Lake Lawn

C02

Grand Geneva

3C1

Mishawaka

C09

Morris

C20

Berrien Springs

C91

Dowagiac

82IS

Landings

IN73

Culver

LL22

Brookeridge

C65

Plymouth

05C

Griffith

C77

Poplar Grove

FEP

Freeport

MWC

Milwaukee Timmerman

RWN

Winnimac

RPJ

Rochelle

UES

Waukesha

RCR

Rochester

EFT

Monroe