BA 489 then AI 2018 at Heathrow
Barcelona → London → New Delhi
Timetable, London time
21:25BA 489 from Barcelona at the gate
21:05AI 2018 to New Delhi leaves the gate
23 h 40 apart on the timetable, overnight
AI 2018 leaves 23 h 40 after BA 489 arrives on the timetable: more than half a day, so not a connection we count.