AS 505 then UA 1276 at LAX
Seattle (SEA) → Los Angeles → Cancún
Timetable, Los Angeles time
08:44AS 505 from Seattle (SEA) at the gate
08:42UA 1276 to Cancún leaves the gate
23 h 58 apart on the timetable, overnight
UA 1276 leaves 23 h 58 after AS 505 arrives on the timetable: more than half a day, so not a connection we count.