Airbus A380 Contrail as seen from KLM Cockpit Boeing B747-400

A huge contrail from an Airbus A380 as seen from cockpit of a Boeing B747 above the South China Sea. We were warned by a HongKong air traffic controller. That's why we were able to film this event. Apologies for shaky camera movements at the end. The Airbus was going too fast to be able to follow it smoothly.