Some of the emails contain instructions about baggage, check-in and other requirements, as well as a short itinerary for the flights - all in the hopes of tricking the recipient into believing that the message is legitimate.
Others are peppered with links that will supposedly take you to the Itineraries page of the Delta website:
Unfortunately, the only thing that you can get from doing this is a piece of information-stealing malware installed on your computer.
Delta Air Lines is obviously aware of the spam run impersonating the company, and is warning its customers against it.
"These messages may claim that you have purchased a Delta ticket, a credit card has been charged, order has been completed, an invoice/receipt is attached to an email or website may offer free flights for following or liking an account," they point out.
"If you see or receive one of these messages, do not open attachments as it may contain potentially dangerous viruses or harm your computer. Be assured that Delta did not send these messages, and our customers’ credit cards have not been charged by Delta as a result of the emails. These messages did not originate from Delta, nor do we believe that any personal information that you provided us was used."