DL 2804 then BA 296 at O'Hare
Boston → Chicago → London
Timetable, Chicago time
22:40DL 2804 from Boston at the gate
21:50BA 296 to London leaves the gate
23 h 10 apart on the timetable, overnight
BA 296 leaves 23 h 10 after DL 2804 arrives on the timetable: more than half a day, so not a connection we count.