BA 472 then QR 3639 at Barcelona
London Heathrow → Barcelona → Firenze
Timetable, Barcelona time
09:15BA 472 from London Heathrow at the gate
07:30QR 3639 to Firenze leaves the gatealso IB 5370, LL 5370, VY 6070
22 h 15 apart on the timetable, overnight
QR 3639 leaves 22 h 15 after BA 472 arrives on the timetable: more than half a day, so not a connection we count.