Shocked travellers couldn't believe their eyes when a woman brought a miniature horse onboard a flight.
The woman was spotted queueing to check in for her American Airlines flight before bringing her companion on board.
American Airlines customers looked on in disbelief as the furry animal trotted down the aisle before calmly taking its seat, according to the Daily Star .
The unusual traveller even took time to pose for photos with the flight's crew as other passenger took selfies with the pony in the background.
Evan Nowak posted a video of the bizarre scenes on the flight from Chicago, Illinois, to Omaha, Nebraska, on Twitter.
He said: "At this time we would like to begin boarding with any active duty military, families travelling with children under the age of 3, and horses..."
Another passenger, Amberley Babbage, also spotted the animal at check-in, tweeting: "There was a small horse in line at the airport today and I’m so curious about it. #ORD"
The horse was later revealed to be a service animal called Flirty - and it even has its own Twitter and Instagram account.
They wrote: "Flirty and I took to the skies, yesterday! It was a great experience and I learned a lot.
"Flirty was FANTASTIC and handled it all like a pro.
"That being said, I’m going to keep travelling by car, it’s just easier on Flirty.
"Flying will be reserved for emergencies and such."
They added: "It’s just too difficult to make sure Flirty doesn’t inconvenience other passengers.
"Because my airport is smaller, the planes are smaller and don’t have solid bulkheads.
"Flirty couldn’t help jostling seat of the person in the last row of first class every time she moved.
"Once we got up to cruising altitude, she took a nap and was very quiet.
"But she had to rebalance quite a bit while ascending and descending and kept bumping the back of their seat through the curtain 'bulkhead.'"
Last year, Southwest Airlines also announced they would allow miniature horses as service animals onto the flight.
However, Delta Airlines has banned any emotional support animals on flights over eight hours.
