Steve Forbes was kind enough to make these WLS airchecks available to us.
WLS Airchecks are alphabetical by WLS personality last names.

WLS Bill Bailey (Duke of Louisviile Aircheck - 1969
The Big 89 WLS - John Rook Program Director
WLS News: Lyle Dean
PAMS Jingle Jingles

WLS Bill Bailey (2) Aircheck - 1973
The Rock of Chicago - Mike McCormick Program Director
PAMS Studio C Singers

WLS Gary Gears for Jerry Kaye Aircheck - January, 1970
Gary Gears was on vacation from KQV Pittsburgh
The Big 89 WLS - John Rook Program Director
WLS News: Jeffrey Hendricks
PAMS Jingle Singers

WLS Larry Lujack Aircheck - October 5, 1970
The Big 89 WLS - John Rook Program Director
WLS News: Jeffrey Hendricks
PAMS Jingle Singers

WLS Larry Lujack Aircheck - December 29, 1968
The Big 89 WLS - John Rook Program Director
WLS News: Jeffrey Hendricks
PAMS Jingle Singers

WLS Art Roberts Aircheck - August, 1968
The Big 89 WLS - John Rook Program Director
WLS News: Chuck Scott
PAMS Jingle Singers

WLS Kris Erik Stevens Aircheck - January, 1972
The Rock of Chicago - Mike McCormick Program Director
PAMS Studio C Singers

WLS Charlie Van Dyke Aircheck - June 30, 1972
The Rock of Chicago - Mike McCormick Program Director
WLS News: Gil Gross
PAMS Studio C Singers

WLS Charlie Van Dyke Aircheck - July 26, 1973
Musicradio WLS - Tommy Edwards Program Director
WLS News: Lyle Dean   
ABCSports: Howard Cosell
PAMS Jingle Singers