CA 1440 then 8L 9988 at Beijing
Chongqing → Beijing → Kunming
Timetable, Beijing time
20:45CA 1440 from Chongqing at the gate
20:158L 9988 to Kunming leaves the gate
23 h 30 apart on the timetable, overnight
8L 9988 leaves 23 h 30 after CA 1440 arrives on the timetable: more than half a day, so not a connection we count.