Qantas is the latest airline to be targeted by email scammers. It is warning customers that fake Qantas "seat selection" emails are circulating.
The airline advised via its Twitter and Facebook accounts that the emails did not come from Qantas and should be deleted immediately.
The emails claim to be a "seat selection fee receipt", informing the recipient they have been charged an exorbitant fee, into the hundreds of dollars, for choosing a seat on a flight.
The emails feature the Qantas logo and link to the Qantas website. But they contain an attachment likely to contain a virus or other harmful software, such as spyware.
The attachment, called "Qantas Airways confirmation", features an unusual ".pdf.zip" file extension, marking it as suspicious.
A Qantas spokeswoman said other telltale signs that the email was fake included that it had no addressee, saying only "Dear" with no name included. Nor did it include a booking reference number or any itinerary details.
"We are aware some customers have received a fake email claiming to be a seat selection fee receipt. These emails are not from Qantas. We advise you not to open any attachment in those emails as they may contain a virus," the airline said on Facebook.
Qantas advised passengers with travel plans to visit qantas.com.au and go to "manage your booking" to check their flight details.
The latest scam comes after Jetstar was recently also hit by fake emails sent out under the subject line "Jetstar flight itinerary".
Other airlines, including Delta and American, have been targeted by similar scams.