A passenger who launched into a obscenity-laced pro-Donald Trump tirade on board a Delta flight to Allentown has been banned for life from flying on the airline.

"He will never again be allowed on a Delta plane," Delta Air Lines CEO Edward Bastian wrote in an internal memo dated Nov. 28, which was obtained by CNBC's Steve Kopack.

The man, who has yet to be identified, shocked passengers on board an Delta flight traveling from Atlanta to Allentown last week when he began yelling about President-elect Trump.

Emma Baum, a passenger on board the flight, posted a 45-second video of the man's tirade to her Facebook page, adding, "Didn't take long to notice that I'm back in 'Merica…" In the video, which quickly went viral, the man can be seen calling passengers, among other things, "Hillary b—es."

Watch (warning: offensive language:)

Delta apologized for the incident, and later said it should have removed the angry passenger from the flight, something Bastian touched on in his email.

"Our team members made the best decision they could given the information they had and allowed him to remain on the flight," Bastian wrote in his memo. "However, if our colleagues had witnessed firsthand what was shown in the video, there is no question they would have removed him from the aircraft.