AA 9602 then UA 4 at Heathrow
Dallas-Fort Worth → London → Houston
Timetable, London time
12:10AA 9602 from Dallas-Fort Worth at the gate
12:05UA 4 to Houston leaves the gate
23 h 55 apart on the timetable, overnight
UA 4 leaves 23 h 55 after AA 9602 arrives on the timetable: more than half a day, so not a connection we count.