While the carrier usually posts about its destinations, a lewd message and link with a reference to a sexual act were added at the top of the page, which has more than 1.4 million likes.
In a statement posted to Facebook, Delta apologized for the "objectionable and offensive content that was posted on our Facebook page earlier."
"With help from Facebook we were able to remove the unauthorized content shortly after it posted. Delta is investigating the source of the hack. No other social media platforms were affected," the statement said.