AA 2896 then UA 2651 at DFW
Chicago O'Hare → Dallas-Fort Worth → Denver
Timetable, Dallas-Fort Worth time
00:43AA 2896 from Chicago O'Hare at the gate
18:43UA 2651 to Denver leaves the gate
18 h apart on the timetable
UA 2651 leaves 18 h after AA 2896 arrives on the timetable: more than half a day, so not a connection we count.