H7 421 then TK 1989 at Istanbul
Chişinău → Istanbul → London Heathrow
Timetable, Istanbul time
16:10H7 421 from Chişinău at the gate
13:10TK 1989 to London Heathrow leaves the gate
21 h apart on the timetable, overnight
TK 1989 leaves 21 h after H7 421 arrives on the timetable: more than half a day, so not a connection we count.