Delta Air Lines Inc. (DAL - Get Report)  has been called the worst airline in America by conservative columnist Ann Coulter after the carrier reportedly gave her seat away Saturday.

Delta shares soared in premarket trading Monday and are marked to open 2.3% higher at $56.40 after guiding a strong third quarter despite missing expectations in the three months to June when it reported earnings on Friday, July 14.

Coulter took to Twitter to vent her frustration that a Delta gate agent, had apparently given her seat, which she had paid $30 to select, away to another passenger.

Delta responded by saying that they would refund's Coulter's $30 but would not tolerate insults to its customers and employees.

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