CA 1492 then CA 903 at Beijing
Zunyi → Beijing → Ho Chi Minh City
Timetable, Beijing time
23:55CA 1492 from Zunyi at the gate
20:15CA 903 to Ho Chi Minh City leaves the gate
20 h 20 apart on the timetable, overnight
CA 903 leaves 20 h 20 after CA 1492 arrives on the timetable: more than half a day, so not a connection we count.