EC 4389 then IB 717 at Madrid
Lyon → Madrid → London Heathrow
Timetable, Madrid time
17:20EC 4389 from Lyon at the gate
13:15IB 717 to London Heathrow leaves the gatealso LA 1539, VY 5179, QR 5345, BA 7056, AA 8755
19 h 55 apart on the timetable, overnight
IB 717 leaves 19 h 55 after EC 4389 arrives on the timetable: more than half a day, so not a connection we count.