AA 1849 then UA 5510 at San Francisco
Dallas-Fort Worth → San Francisco → Carlsbad
Timetable, San Francisco time
10:16AA 1849 from Dallas-Fort Worth at the gate
10:10UA 5510 to Carlsbad leaves the gate
23 h 54 apart on the timetable, overnight
UA 5510 leaves 23 h 54 after AA 1849 arrives on the timetable: more than half a day, so not a connection we count.