Qantas Airways said on Thursday one of its Airbus A380 experienced a short burst of wake turbulence from another A380 flying ahead and above it.
No passengers were injured and there was no aircraft damage from the incident which involved an A380 taking off from Los Angeles late on Sunday LA time bound for Melbourne, flying behind another Qantas A380 en route to Sydney, a Qantas spokesman said.
Wake turbulence forms behind an aircraft as it passes through the air, and air traffic control requires more spacing behind larger jets like the A380 to avoid it.
Wake turbulence is uncommon and typically involves a larger jet and a smaller aircraft rather than two super-jumbos.
The aircraft were 20 nautical miles apart in distance and 1000 feet in altitude.
The wake turbulence was due to another A380 above and ahead of the QF94, operating the QF 12 to Sydney.