AA 2551 then AA 2120 at DFW
Houston → Dallas-Fort Worth → San Francisco
Timetable, Dallas-Fort Worth time
07:26AA 2551 from Houston at the gate
07:02AA 2120 to San Francisco leaves the gate
23 h 36 apart on the timetable, overnight
AA 2120 leaves 23 h 36 after AA 2551 arrives on the timetable: more than half a day, so not a connection we count.