WN 3723 then UA 1552 at Phoenix
San Diego → Phoenix → Chicago O'Hare
Timetable, Phoenix time
20:55WN 3723 from San Diego at the gate
15:37UA 1552 to Chicago O'Hare leaves the gate
18 h 42 apart on the timetable, overnight
UA 1552 leaves 18 h 42 after WN 3723 arrives on the timetable: more than half a day, so not a connection we count.