Delta Air Lines says it has received reports from customers of fraudulent emails claiming to be from Delta.
The emails say you have purchased a Delta ticket, and that a credit card has been charged and a receipt is attached.
If you receive one of these emails, delete it. Do not open the attachment as it may contain potentially dangerous viruses or harm your computer.
"Be assured that Delta did not send these emails, and our customers' credit cards have not been charged by Delta as a result of the emails," Delta said in an alert message. "These emails did not originate from Delta, nor do we believe that any personal information that you provided us was used to generate these emails."
Delta recommends SkyMiles account holders change their PIN immediately and monitor their account for any misuse.
American Airlines investigated a similar phishing email scam in January.