LH 455 then 4Y 10 at Frankfurt
San Francisco → Frankfurt am Main → Cancún
Timetable, Frankfurt am Main time
10:30LH 455 from San Francisco at the gate
10:104Y 10 to Cancún leaves the gate
23 h 40 apart on the timetable, overnight
4Y 10 leaves 23 h 40 after LH 455 arrives on the timetable: more than half a day, so not a connection we count.