Air Illinois   de Havilland Canada DHC-6 Twin Otter 300   N123SL            (c/n 735)


                               This color illustration came from a post card gleaned from Air Illinois in the 1970s.   Air Illinois
                               was a commuter line founded in 1970 in Carbondale, Illinois.   It commenced services with two
                               Beechcraft 99s and then acquired eight Twin Otters 200s and 300s during the 1970s and early
                              1980s.  N123SL was a new machine, delivered in December 1980.  Air Illinois was one of the
                              few airlines to operate from Chicago's downtown airport, Meigs Field.