Delta Air Lines has released a memo from CEO Ed Bastian to employees after a video of an unruly passenger aboard a Delta flight went viral last week and drew criticism of the carrier.

While Bastian praised employees' efforts during the Thanksgiving travel holiday, he said the passenger in the video should have been removed from the aircraft and vowed: "[h]e will never again be allowed on a Delta plane."

The man in the video praised Donald Trump in an expletive-laden rant that included the comment "We got some Hillary b*tches on here? Come on, baby. Trump!"

While Delta staffers questioned the man, he was allowed to remain aboard the flight.

Bastian said Delta apologized to customers aboard the flight and refunded the cost of their tickets. He added: "I also want to make sure all of you know we have your backs. The heightened tension in our society means that now more than ever we must require civility on our planes and in our facilities."

The memo was released a day after a statement from the airline apologizing for the incident.