AA 2600 then UA 5191 at O'Hare
Boston → Chicago → Lancaster
Timetable, Chicago time
12:33AA 2600 from Boston at the gate
08:50UA 5191 to Lancaster leaves the gate
20 h 17 apart on the timetable, overnight
UA 5191 leaves 20 h 17 after AA 2600 arrives on the timetable: more than half a day, so not a connection we count.