UA 3909 then AA 901 at San Francisco
Chicago O'Hare → San Francisco → Phoenix
Timetable, San Francisco time
22:20UA 3909 from Chicago O'Hare at the gate
19:05AA 901 to Phoenix leaves the gate
20 h 45 apart on the timetable, overnight
AA 901 leaves 20 h 45 after UA 3909 arrives on the timetable: more than half a day, so not a connection we count.