UA 5740 then AF 2134 at San Francisco
Medford → San Francisco → Detroit
Timetable, San Francisco time
07:35UA 5740 from Medford at the gate
11:58AF 2134 to Detroit leaves the gate
4 h 23 apart on the timetable
The last days
UA 5740 and AF 2134 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.