A Qantas A380 superjumbo has collided with another of the airline's Boeing 747-400 jumbos at Los Angeles International Airport, causing damage to the wing tips of both planes and forcing the cancellation of flights.

The incident occurred at 9pm local time (4pm AEST time) on Thursday while the aircraft were being towed out of a hangar.

Sources said they believed the planes had suffered "millions of dollars" worth of damage.