LH 7913 then AA 597 at San Francisco
Tucson → San Francisco → Chicago O'Hare
Timetable, San Francisco time
14:50LH 7913 from Tucson at the gate
17:22AA 597 to Chicago O'Hare leaves the gatealso QF 4712
2 h 32 apart on the timetable
The last days
LH 7913 and AA 597 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.