AA 1965 then UA 1537 at Philadelphia
Tampa → Philadelphia → Denver
Timetable, Philadelphia time
10:40AA 1965 from Tampa at the gate
10:00UA 1537 to Denver leaves the gate
23 h 20 apart on the timetable, overnight
UA 1537 leaves 23 h 20 after AA 1965 arrives on the timetable: more than half a day, so not a connection we count.