UA 5519 then UA 545 at San Francisco
Carlsbad → San Francisco → Austin
Timetable, San Francisco time
09:19UA 5519 from Carlsbad at the gate
08:40UA 545 to Austin leaves the gatealso AC 5289, VA 8467
23 h 21 apart on the timetable, overnight
UA 545 leaves 23 h 21 after UA 5519 arrives on the timetable: more than half a day, so not a connection we count.