AA 50 then BA 870 at Heathrow
Dallas-Fort Worth → London → Budapest
Timetable, London time
06:50AA 50 from Dallas-Fort Worth at the gate
19:30BA 870 to Budapest leaves the gate
12 h 40 apart on the timetable
BA 870 leaves 12 h 40 after AA 50 arrives on the timetable: more than half a day, so not a connection we count.