UA 3878 then AA 6197 at Houston
IAB → Houston → Dallas-Fort Worth
Timetable, Houston time
22:40UA 3878 from IAB at the gate
12:06AA 6197 to Dallas-Fort Worth leaves the gate
13 h 26 apart on the timetable, overnight
AA 6197 leaves 13 h 26 after UA 3878 arrives on the timetable: more than half a day, so not a connection we count.