BA 1395 then AA 9600 at Heathrow
Belfast City → London → Chicago
Timetable, London time
13:05BA 1395 from Belfast City at the gate
13:00AA 9600 to Chicago leaves the gate
23 h 55 apart on the timetable, overnight
AA 9600 leaves 23 h 55 after BA 1395 arrives on the timetable: more than half a day, so not a connection we count.