rmadisonwi...

As a timetable collector (with domestic timetables back to about 1960), I just pulled the CO Onepass TT (mini) from December 17, 1992.

Christmas day that year was a Friday.. so.. here are the flights listed MKE-CLE:

530a-740a CO446 737 (abbreviation for 737-100 according to legend)
1125a-148p CO3194 EM2
340p-550p CO 1500 737-100
615p-840p CO3198 ATR

Hope this helps!!

troy