A SpaceX Falcon 9 rocket.CHANDAN KHANNA/Getty ImagesSpaceX rockets coming back to Earth are disrupting flights over the southern Indian OceanQantas said flights have been delayed up to six hours, while South African Airways is also impacted.Australia's flag carrier wants Elon Musk's company to have more precise plans.A number of flights over the Indian Ocean have been forced to be delayed due to SpaceX rockets coming back to Earth.Qantas, the Australian flag carrier, is asking Elon Musk's company to be more precise with the areas and timings for such events.Some of its flights between Sydney and Johannesburg have faced delays of up to six hours, Qantas said.The Sydney to Johannesburg route passes over the southern Indian Ocean, where the upper stages of several SpaceX rockets have recently splashed down."Over the past few weeks we've had to delay several flights between Johannesburg and Sydney due to advice received from the US Government regarding the re-entry of SpaceX rockets over an extensive area of the Southern Indian Ocean," Ben Holland, the head of Qantas' operations center, said in a statement shared with Business Insider.The Guardian reported that South African Airways has also been impacted by SpaceX activity.