Delta Air Lines is apologizing for not removing a passenger from a flight to Pennsylvania who rudely professed his support for President-elect Donald Trump and insulted those who didn’t.

The (Allentown) Morning Call first reported on a video posted on Facebook by a fellow passenger on the Tuesday flight from Atlanta to Allentown. The video shows the man standing in the aisle, yelling and insulting Hillary Clinton supporters.

Delta said on its website Saturday that it is “sorry this disruption happened” and says the airline is responsible for “ensuring all customers feel safe and comfortable.”