Someone at US Airways violated one of the most obvious rules of corporate social-media management - don't tweet lewd images.

US Airways responded to a tweet from a customer named Elle, who complained about the airline's service, by encouraging her to file a customer service complaint.

But instead of linking to the form, the airline shared a graphic photo of a woman with a model plane between her legs.

Twitter users immediately pointed out the indiscretion. US Airways removed the photo and apologized:

"We apologize for an inappropriate image recently shared as a link in one of our responses," the airline tweeted.

In a statement, US Airways said that they had "captured the tweet to flag it as inappropriate."

"Unfortunately the image was inadvertently included in a response to a customer. We immediately realized the error and removed our tweet. We deeply regret the mistake and we are currently reviewing our processes to prevent such errors in the future," read the statement.