In one tweet, Coulter refers to Delta as "the worst airline in America."
Just when you think it's safe to fly them again, the worst airline in America is STILL: @Delta— Ann Coulter (@AnnCoulter) July 15, 2017
Coulter was on a flight Saturday from New York to West Palm Beach, Florida, when there was a mix up with the seating arrangement, according to Delta.
Delta initially responded to Coulter via Twitter with a brief apology.
Coulter also posted a photo of the passenger she said was given her seat.
On Sunday, Coulter continued to aim her ire at Delta:
Airline crew training at @Delta: Replicate Stanley Milgram's prison experiment at Yale, inducing normal ppl to brutally torture fellow man.— Ann Coulter (@AnnCoulter) July 16, 2017
The carrier issued a statement condemning Coulter’s maelstrom on social media.
"We are disappointed that the customer has chosen to publicly attack our employees and other customers by posting derogatory and slanderous comments and photos in social media. Her actions are unnecessary and unacceptable," Delta said. "We will refund Ms. Coulter's $30 for the preferred seat on the exit row that she purchased."