AA 2389 then UA 8130 at O'Hare
Calgary → Chicago → Sioux Falls
Timetable, Chicago time
18:44AA 2389 from Calgary at the gate
20:30UA 8130 to Sioux Falls leaves the gate
1 h 46 apart on the timetable
The last days
AA 2389 and UA 8130 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.