AA 214 then UA 3907 at O'Hare
Dallas-Fort Worth → Chicago → Washington
Timetable, Chicago time
12:24AA 214 from Dallas-Fort Worth at the gate
12:00UA 3907 to Washington leaves the gate
23 h 36 apart on the timetable, overnight
UA 3907 leaves 23 h 36 after AA 214 arrives on the timetable: more than half a day, so not a connection we count.