AA 644 then UA 370 at Phoenix
Tampa → Phoenix → Chicago O'Hare
Timetable, Phoenix time
20:50AA 644 from Tampa at the gate
18:22UA 370 to Chicago O'Hare leaves the gate
21 h 32 apart on the timetable, overnight
UA 370 leaves 21 h 32 after AA 644 arrives on the timetable: more than half a day, so not a connection we count.