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According to Live and Let's Fly, the woman said the peacock was an emotional-support animal, allowed to fly for free. While the woman also offered to pay for the peacock's ticket, the blog said, United would not let the animal onto the flight.
United said in a statement to Business Insider: "This animal did not meet guidelines for a number of reasons, including its weight and size. We explained this to the customer on three separate occasions before she arrived at the airport."
The airline also said it requires passengers to "provide documentation from a medical professional and at least 48 hours' advance notice" before bringing an emotional-support animal onto a flight.
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http://www.businessinsider.com/united-denies-womans-attempt-to-bring-peacock-onto-flight-2018-1