UA 3878 then AA 2667 at Houston
IAB → Houston → Philadelphia
Timetable, Houston time
22:40UA 3878 from IAB at the gate
12:46AA 2667 to Philadelphia leaves the gate
14 h 06 apart on the timetable, overnight
AA 2667 leaves 14 h 06 after UA 3878 arrives on the timetable: more than half a day, so not a connection we count.