AA 642 then UA 2220 at O'Hare
Dallas-Fort Worth → Chicago → Boston
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
12:30UA 2220 to Boston leaves the gate
23 h 20 apart on the timetable, overnight
UA 2220 leaves 23 h 20 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.