AA 1878 then UA 5707 at Salt Lake City
Dallas-Fort Worth → Salt Lake City → Chicago O'Hare
Timetable, Salt Lake City time
10:30AA 1878 from Dallas-Fort Worth at the gate
12:29UA 5707 to Chicago O'Hare leaves the gate
1 h 59 apart on the timetable
The last days
AA 1878 and UA 5707 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.