AA 2810 then UA 3912 at San Francisco
Dallas-Fort Worth → San Francisco → Houston
Timetable, San Francisco time
18:02AA 2810 from Dallas-Fort Worth at the gatealso QF 3234, BA 4359
23:00UA 3912 to Houston leaves the gate
4 h 58 apart on the timetable
The last days
AA 2810 and UA 3912 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.