EK 6107 then UA 1271 at San Francisco
Houston → San Francisco → Mexico City
Timetable, San Francisco time
10:46EK 6107 from Houston at the gatealso CA 7372
10:45UA 1271 to Mexico City leaves the gatealso AC 3479, NZ 9821
23 h 59 apart on the timetable, overnight
UA 1271 leaves 23 h 59 after EK 6107 arrives on the timetable: more than half a day, so not a connection we count.