UA 8173 then AA 4229 at O'Hare
Cleveland → Chicago → Knoxville
Timetable, Chicago time
10:54UA 8173 from Cleveland at the gate
13:45AA 4229 to Knoxville leaves the gate
2 h 51 apart on the timetable
The last days
UA 8173 and AA 4229 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.