UA 580 then UA 3235 at Houston
Los Angeles → Houston → Louisville
Timetable, Houston time
05:13UA 580 from Los Angeles at the gate
20:45UA 3235 to Louisville leaves the gate
15 h 32 apart on the timetable
UA 3235 leaves 15 h 32 after UA 580 arrives on the timetable: more than half a day, so not a connection we count.