Passengers onboard Delta Flight 486 from Atlanta to New York would have been forgiven for thinking they were imagining things when they heard the captain enquire: "Is anyone here allergic to penguins?"
But then, when a pair of foot-and-a-half tall penguins waddled down the aisle of the plane cruising at an altitude of 30,000 feet, they probably realised they weren't.
Pete and Penny -- aged 6 and 12 -- were travelling from Atlanta to New Yorkt to the premiere of "Frozen Planet," a new Discovery Channel documentary.
One passenger said: "This is video proof that penguins CAN fly -- and that they have absolutely no fear of flying at all!
"When we reached cruising altitude, the captain allowed their handler to take them for a stroll up and down the aisle so that everyone could take a look at the cute, one-foot-tall penguins and get some great photos and videos."