UA 4522 then UA 3752 at Dulles
Huntsville → Washington → Lafayette Purdue University
Timetable, Washington time
16:15UA 4522 from Huntsville at the gate
12:05UA 3752 to Lafayette Purdue University leaves the gate
19 h 50 apart on the timetable, overnight
UA 3752 leaves 19 h 50 after UA 4522 arrives on the timetable: more than half a day, so not a connection we count.