BA 753 then AA 51 at Heathrow
Geneva → London → Dallas-Fort Worth
Timetable, London time
09:00BA 753 from Geneva at the gate
08:20AA 51 to Dallas-Fort Worth leaves the gate
23 h 20 apart on the timetable, overnight
AA 51 leaves 23 h 20 after BA 753 arrives on the timetable: more than half a day, so not a connection we count.