UA 920 then BA 1302 at Heathrow
Chicago → London → Aberdeen
Timetable, London time
07:55UA 920 from Chicago at the gate
07:40BA 1302 to Aberdeen leaves the gate
23 h 45 apart on the timetable, overnight
BA 1302 leaves 23 h 45 after UA 920 arrives on the timetable: more than half a day, so not a connection we count.