BA 391 then BA 193 at Heathrow
Brussels → London → Dallas-Fort Worth
Timetable, London time
16:15BA 391 from Brussels at the gate
14:45BA 193 to Dallas-Fort Worth leaves the gate
22 h 30 apart on the timetable, overnight
BA 193 leaves 22 h 30 after BA 391 arrives on the timetable: more than half a day, so not a connection we count.