United Airlines is facing yet another PR disaster after it emerged last night,that a rabbit destined to be the world’s biggest mysteriously died on a flight to the US.

Giant bunny Simon, who measured three-foot long, was placed in the cargo hold of a United Boeing 767 at Heathrow on his way to a new celebrity owner in America.

But when the jet landed at Chicago’s O’Hare airport, the valuable rabbit was found dead, according to The Sun .

British breeder Annette Edwards said Simon, who was destined to overtake his father as the world’s biggest rabbit , was healthy when he was placed on the United flight.

She told the newspaper:

 “Simon had a vet’s check-up three hours before the flight and was fit as a fiddle.
“Something very strange has happened and I want to know what. I’ve sent rabbits all around the world and nothing like this has happened before.”

Annette, 65, from Stoulton, Worcestershire, added that Simon’s new celebrity owner had been left “upset” by the animal’s sudden death.

The giant rabbits cost £5,000 a year to keep and Annette hires hers out for £500 a time.

The scandal is the latest to hit United, which is fighting to restore its reputation after footage emerged showing a doctor being violently dragged from an overbooked flight.