UA 3878 then AA 3911 at Houston
IAB → Houston → Dallas-Fort Worth
Timetable, Houston time
22:40UA 3878 from IAB at the gate
14:01AA 3911 to Dallas-Fort Worth leaves the gate
15 h 21 apart on the timetable, overnight
AA 3911 leaves 15 h 21 after UA 3878 arrives on the timetable: more than half a day, so not a connection we count.