UA 4476 then AA 2414 at Dulles
Portland (Maine) → Washington → Dallas-Fort Worth
Timetable, Washington time
16:16UA 4476 from Portland (Maine) at the gate
14:42AA 2414 to Dallas-Fort Worth leaves the gate
22 h 26 apart on the timetable, overnight
AA 2414 leaves 22 h 26 after UA 4476 arrives on the timetable: more than half a day, so not a connection we count.