Originally Posted by Turbojet

Several reasons for CX to refuel 883:
1. Cargo offloaded from 881
2. Passengers on 883 can still make their connection in time if 883 needs refuel.

Why cannot 883 and 881 depart within 20 min?
It might a time-slot issue.

How does CX predict 883 needing refuel?
1. unable to get an economic cruise attitute
2. more payload
3. strong wind
4. more regional traffic into/intra Asia or west Pacific