|Air Illinois Springfield timetable dated January 17, 1972|
Only 5 roundtrips were being operated, which increased to 8 by March 1
Air Illinois was already operating 8 weekday roundtrips between Springfield and Meigs, so capacity on the route more than doubled when Ozark began offering 9 weekday roundtrips on March 15, 1972.
|Fold-over postcard promoting new Springfield - Chicago (Meigs) service|
|Interior of promotional postcard showing flight schedule|
|Ozark Air Lines timetable dated March 1, 1972|
|From the March 1, 1972 timetable|
Full-page ad for Springfield - Chicago (Meigs) Twin Otter service, beginning March 15th
Perhaps Ozark thought the market would support both carriers, or that their name recognition would wrest market share away from the smaller airline, but the service lasted less than a year, with Air Illinois emerging as the victor.
In late 1973, Air Illinois acquired a 48-seat HS 748 for use on the route. The 748 shaved 15 minutes from the Twin Otter's flight time (about an hour), and despite a reduction in frequency to 5 roundtrips daily, capacity was significantly increased.
|From the January 1, 1974 Official Airline Guide|
Chicago to Springfield, IL schedules showing Air Illinois flights under codes "QX" and "UX"