UA 3236 then AA 4923 at Houston
Mc Allen → Houston → Los Angeles
Timetable, Houston time
20:10UA 3236 from Mc Allen at the gate
15:23AA 4923 to Los Angeles leaves the gate
19 h 13 apart on the timetable, overnight
AA 4923 leaves 19 h 13 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.