BA 902 then VL 1428 at Frankfurt
London Heathrow → Frankfurt am Main → Sofia
Timetable, Frankfurt am Main time
15:30BA 902 from London Heathrow at the gate
14:55VL 1428 to Sofia leaves the gate
23 h 25 apart on the timetable, overnight
VL 1428 leaves 23 h 25 after BA 902 arrives on the timetable: more than half a day, so not a connection we count.