UA 3236 then AA 5532 at Houston
Mc Allen → Houston → Washington National
Timetable, Houston time
20:10UA 3236 from Mc Allen at the gate
17:20AA 5532 to Washington National leaves the gate
21 h 10 apart on the timetable, overnight
AA 5532 leaves 21 h 10 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.