Qantas shares dropped 3.6 per cent after it revealed the hack on Wednesday. The airline is the latest Australian company to be affected by a cyber attack, with telecoms company Optus, healthcare provider Medibank Private, a number of Australian pension funds and port operator DP World all hit in the past three years.

Who are Scattered Spider? FBI warns M&S hackers are now targeting airline industry - British teens are thought to be among the members of the international group

The FBI has issued a warning to the airline sector about the growing threat posed by the cybercriminal gang Scattered Spider, a group responsible for a series of sophisticated hacks against major U.S. companies and government agencies.