Delta Air Lines has hit back at "unacceptable and unnecessary insults" from political pundit Ann Coulter after she ranted on social media about being moved seats on a flight.

The outspoken conservative commentator had lambasted the airline over the weekend after she was removed from a seat that she said she had specifically booked for a flight from La Guardia Airport in New York to West Palm Beach, Florida.

Ms Coulter went on to complain that Delta “spends all this $$$ on beautiful aircraft & then hire Nurse Ratchets as flight attendants & gate agents,” a reference to Nurse Ratched, a strict character in the film “One Flew Over the Cuckoo’s Nest.”