UA 5588 then AA 2801 at LAX
Fresno → Los Angeles → Cancún
Timetable, Los Angeles time
09:26UA 5588 from Fresno at the gate
08:26AA 2801 to Cancún leaves the gate
23 h apart on the timetable, overnight
AA 2801 leaves 23 h after UA 5588 arrives on the timetable: more than half a day, so not a connection we count.