QR 729 then DL 521 at DFW
Doha → Dallas-Fort Worth → Los Angeles
Timetable, Dallas-Fort Worth time
15:30QR 729 from Doha at the gate
13:38DL 521 to Los Angeles leaves the gate
22 h 08 apart on the timetable, overnight
DL 521 leaves 22 h 08 after QR 729 arrives on the timetable: more than half a day, so not a connection we count.