UA 321 then WN 3388 at Phoenix
Chicago O'Hare → Phoenix → Milwaukee
Timetable, Phoenix time
12:24UA 321 from Chicago O'Hare at the gate
09:55WN 3388 to Milwaukee leaves the gate
21 h 31 apart on the timetable, overnight
WN 3388 leaves 21 h 31 after UA 321 arrives on the timetable: more than half a day, so not a connection we count.