It was only when Coulter began tweeting on Saturday that Delta became aware of the issue, the airline added.
According to her, they had given her seat to a person who was neither old, nor a child, nor sick, nor an "air marshall or a tall person".
Delta said that while some confusion related to seating assignments had taken place initially, all of its passengers complied with the request made by the flight attendant to move to the seats that were listed on their individual tickets.
As part of her two-hour tweet tantrum, Coulter said she asked a flight attendant, "Why are you taking me out of the extra room seat I specifically booked?"
Coulter, who has 1.6 million followers, likened Delta employees to Nurse Ratched, the heartless villain in "One Flew Over the Cuckoo's Nest", called Delta the "worst airline in America", and suggested the ideal job for a Delta employee would be prison guard, animal handler or an East German policeman.
The six-foot-tall Coulter had booked an aisle seat for the extra legroom during the flight from NY to Palm Beach, Florida. Of course, she ended that tweet with "Delta sucks".
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In a second photo, Coulter showed a woman seated in an aisle seat who she claims took her original seat.
Coulter's tweets generated a fair amount of support from others on social media, with some of her backers saying they would not fly with the US airline.
Getting her photo taken without permission and seeing it splashed across social media did not go down well. They offered to refund her $30.
- Ann Coulter (@AnnCoulter) July 15, 2017Suck-ass @Delta spends all this $$$ on handsome aircraft & then hire Nurse Ratchets as flight attendants & gate agents.
"Ann Coulter was tripping over $30".
Nevertheless, some of Ann's fans jumped to her defense. The policy explicitly states that "Delta accommodates the seating requirements of customers with certain types of disabilities", which might lead to seating changes regardless of whether someone has pre-booked a seat.