AM 686 then UA 5191 at O'Hare
Mexico City → Chicago → Lancaster
Timetable, Chicago time
13:12AM 686 from Mexico City at the gate
08:50UA 5191 to Lancaster leaves the gate
19 h 38 apart on the timetable, overnight
UA 5191 leaves 19 h 38 after AM 686 arrives on the timetable: more than half a day, so not a connection we count.